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  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentTaxLiabilities" xlink:to="lab_ifrs-full_CurrentTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived_37151ea9-62dc-451c-890e-7139d1d80075_terseLabel_es" xlink:label="lab_ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Préstamos corrientes recibidos y parte corriente de préstamos no corrientes recibidos.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived"/>
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    <link:label id="lab_ifrs-full_CurrentLiabilitiesAbstract_1715e2a8-1d87-4a1f-a1cc-0ea36de591c6_terseLabel_es" xlink:label="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Current liabilities [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentLiabilitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilitiesAbstract" xlink:to="lab_ifrs-full_CurrentLiabilitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherExpenseByNature_aa7b6da2-90ff-4439-9b27-caa603ecc365_negatedTerseLabel_es" xlink:label="lab_ifrs-full_OtherExpenseByNature" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherExpenseByNature" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherExpenseByNature"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherExpenseByNature" xlink:to="lab_ifrs-full_OtherExpenseByNature" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_ff8d3ef4-e908-432b-bac5-eea15f971ecf_terseLabel_es" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash and cash equivalents</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_4dcf1e5e-b270-476b-9afd-5043651bba8f_periodStartLabel_es" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash and cash equivalents at beginning of period</link:label>
    <link:label id="lab_ifrs-full_CashAndCashEquivalents_b76b9245-9279-4977-914e-6b72af46430c_periodEndLabel_es" xlink:label="lab_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash and cash equivalents at end of period</link:label>
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    <link:label id="lab_ifrs-full_TreasuryShares_215334fb-9ccb-433a-bc29-483cf03e6b59_negatedTerseLabel_es" xlink:label="lab_ifrs-full_TreasuryShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Treasury shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasuryShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_TreasuryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TreasuryShares" xlink:to="lab_ifrs-full_TreasuryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialAssetsExplanatory_fcda534a-5a59-44bb-9aad-5b9e9ed002d5_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfFinancialAssetsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of financial assets [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsExplanatory"/>
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    <link:label id="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities_04f1baf6-c556-4f49-a20a-9947116d13d0_negatedTerseLabel_es" xlink:label="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Dividends paid, classified as financing activities</link:label>
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    <link:label id="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_863c7890-f28a-4aca-a0c5-b0fc6e9ddcd8_negatedTerseLabel_es" xlink:label="lab_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Payments to acquire or redeem entity's shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"/>
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    <link:label id="lab_mer_DistributionOfResults_2b26f5db-e439-46b6-b53d-6f0d31f42ade_terseLabel_es" xlink:label="lab_mer_DistributionOfResults" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Distribution of results</link:label>
    <link:label id="lab_mer_DistributionOfResults_label_es" xlink:label="lab_mer_DistributionOfResults" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Distribution of results</link:label>
    <link:label id="lab_mer_DistributionOfResults_documentation_es" xlink:label="lab_mer_DistributionOfResults" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The amount of distribution of results</link:label>
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    <link:label id="lab_ifrs-full_TradeAndOtherCurrentReceivables_e86fec9c-f084-42e1-ab23-f3e2e045ea52_terseLabel_es" xlink:label="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Trade and other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ProceedsFromSalesOfInvestments_45cd6b47-a0f9-4fdd-962d-1af0597afa2e_totalLabel_es" xlink:label="lab_mer_ProceedsFromSalesOfInvestments" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of investments</link:label>
    <link:label id="lab_mer_ProceedsFromSalesOfInvestments_label_es" xlink:label="lab_mer_ProceedsFromSalesOfInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of investments</link:label>
    <link:label id="lab_mer_ProceedsFromSalesOfInvestments_documentation_es" xlink:label="lab_mer_ProceedsFromSalesOfInvestments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ProceedsFromSalesOfInvestments" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ProceedsFromSalesOfInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ProceedsFromSalesOfInvestments" xlink:to="lab_mer_ProceedsFromSalesOfInvestments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_13493f71-fdd6-44e6-89ea-9287fb9ad33c_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of entity's operating segments [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity_312ae6b5-d1b8-41c6-a870-d51e74dcfbff_terseLabel_es" xlink:label="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Increase (decrease) through share-based payment transactions Stock Plan 2016, equity</link:label>
    <link:label id="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity_label_es" xlink:label="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Increase (decrease) through share-based payment transactions Stock Plan, equity</link:label>
    <link:label id="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity_documentation_es" xlink:label="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity" xlink:to="lab_mer_IncreaseDecreaseThroughShareBasedPaymentTransactionsStockPlanEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ReservesMember_edd8c972-3adc-44ca-8175-f37b1199cce2_terseLabel_es" xlink:label="lab_mer_ReservesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves [Member]</link:label>
    <link:label id="lab_mer_ReservesMember_label_es" xlink:label="lab_mer_ReservesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves [Member]</link:label>
    <link:label id="lab_mer_ReservesMember_documentation_es" xlink:label="lab_mer_ReservesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ReservesMember" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ReservesMember"/>
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    <link:label id="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities_b3b49aca-e522-4a33-9254-fc3df6ab085c_totalLabel_es" xlink:label="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from financial liabilities</link:label>
    <link:label id="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities_label_es" xlink:label="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from financial liabilities</link:label>
    <link:label id="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities_documentation_es" xlink:label="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from financial liabilities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ProceedsAndPaymentsFromFinancialLiabilities" xlink:to="lab_mer_ProceedsAndPaymentsFromFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ProceedsAndPaymentsFromEquityInstruments_d3b21d96-32de-4c08-b2a1-e8ad020ff2e9_negatedTotalLabel_es" xlink:label="lab_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from equity instruments</link:label>
    <link:label id="lab_mer_ProceedsAndPaymentsFromEquityInstruments_label_es" xlink:label="lab_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from equity instruments</link:label>
    <link:label id="lab_mer_ProceedsAndPaymentsFromEquityInstruments_documentation_es" xlink:label="lab_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds and payments from equity instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ProceedsAndPaymentsFromEquityInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:to="lab_mer_ProceedsAndPaymentsFromEquityInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAndLiabilities_7671418b-aeac-4a29-a618-08a1eff429dd_totalLabel_es" xlink:label="lab_ifrs-full_EquityAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Equity and liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAndLiabilities" xlink:to="lab_ifrs-full_EquityAndLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfInvestmentProperty_925ee497-6023-4b37-b7f2-9cfbcfddf64c_negatedTerseLabel_es" xlink:label="lab_ifrs-full_PurchaseOfInvestmentProperty" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Purchase of investment property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfInvestmentProperty" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PurchaseOfInvestmentProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfInvestmentProperty" xlink:to="lab_ifrs-full_PurchaseOfInvestmentProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures_e2da97fd-980d-4b1d-9ab9-1ea04d507a8e_terseLabel_es" xlink:label="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cobros procedentes de la emisión de obligaciones con y sin garantía y pagarés</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:to="lab_ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainRecognisedInBargainPurchaseTransaction_db4c5446-8e17-420e-b5db-fc7738fb58b9_terseLabel_es" xlink:label="lab_ifrs-full_GainRecognisedInBargainPurchaseTransaction" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancia reconocida en una transacción de compra en condiciones muy ventajosas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainRecognisedInBargainPurchaseTransaction" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_GainRecognisedInBargainPurchaseTransaction"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainRecognisedInBargainPurchaseTransaction" xlink:to="lab_ifrs-full_GainRecognisedInBargainPurchaseTransaction" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PrincipalPlaceOfBusiness_39efe3c7-9e7f-4d17-9e5a-501b88e63ec5_terseLabel_es" xlink:label="lab_ifrs-full_PrincipalPlaceOfBusiness" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Principal place of business</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PrincipalPlaceOfBusiness" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PrincipalPlaceOfBusiness"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PrincipalPlaceOfBusiness" xlink:to="lab_ifrs-full_PrincipalPlaceOfBusiness" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForFairValueGainsLosses_ca02533a-c309-418d-9c83-df44ce7e0937_terseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for fair value losses (gains)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:to="lab_ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherNoncurrentFinancialLiabilities_56dfd441-b73b-47cd-94fa-9ed6d3c7a208_terseLabel_es" xlink:label="lab_ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other non-current financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherNoncurrentFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:to="lab_ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AssetsAbstract_967d4b87-9a4d-4713-a4e2-1180d795fdc2_terseLabel_es" xlink:label="lab_ifrs-full_AssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AssetsAbstract" xlink:to="lab_ifrs-full_AssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_AmountsTransferredToIncomeStatement_0870b234-a340-42c7-b1d5-2ff8e3295854_terseLabel_es" xlink:label="lab_mer_AmountsTransferredToIncomeStatement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Amounts transferred to income statement</link:label>
    <link:label id="lab_mer_AmountsTransferredToIncomeStatement_label_es" xlink:label="lab_mer_AmountsTransferredToIncomeStatement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Amounts transferred to income statement</link:label>
    <link:label id="lab_mer_AmountsTransferredToIncomeStatement_documentation_es" xlink:label="lab_mer_AmountsTransferredToIncomeStatement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Amounts transferred to income statement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_AmountsTransferredToIncomeStatement" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_AmountsTransferredToIncomeStatement"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_AmountsTransferredToIncomeStatement" xlink:to="lab_mer_AmountsTransferredToIncomeStatement" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParent_333fb14a-3d2d-4f75-b095-d83f31a98d87_totalLabel_es" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total equity attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_SharePremiumMember_01756b1a-693e-4257-b625-2e8590565dfa_terseLabel_es" xlink:label="lab_ifrs-full_SharePremiumMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Share premium [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremiumMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_SharePremiumMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_SharePremiumMember" xlink:to="lab_ifrs-full_SharePremiumMember" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_Reserves_2a4d1cc3-bf6b-45cf-930b-e1e3ffc124b9_terseLabel_es" xlink:label="lab_mer_Reserves" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves</link:label>
    <link:label id="lab_mer_Reserves_label_es" xlink:label="lab_mer_Reserves" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves</link:label>
    <link:label id="lab_mer_Reserves_documentation_es" xlink:label="lab_mer_Reserves" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserves</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_Reserves" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_Reserves"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_Reserves" xlink:to="lab_mer_Reserves" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities_8039a5f8-470a-4fed-9fab-bf93b45b9ffb_terseLabel_es" xlink:label="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for decrease increase in other assets and liabilities</link:label>
    <link:label id="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities_label_es" xlink:label="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for decrease increase in other assets and liabilities</link:label>
    <link:label id="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities_documentation_es" xlink:label="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for decrease (increase) in other assets and liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:to="lab_mer_AdjustmentsForDecreaseIncreaseInOtherAssetsAndLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReserveOfCashFlowHedges_6b87ff7a-29c8-4bd5-a7ae-afda98d15d80_terseLabel_es" xlink:label="lab_ifrs-full_ReserveOfCashFlowHedges" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserva de cobertura de flujos de efectivo</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfCashFlowHedges" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ReserveOfCashFlowHedges"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReserveOfCashFlowHedges" xlink:to="lab_ifrs-full_ReserveOfCashFlowHedges" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_93aa00ca-354e-4d17-a04d-b8597b54bc57_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of cash and cash equivalents [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_70dfc50d-9369-4b56-a0fb-9941786ac9b7_negatedTotalLabel_es" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_RepaymentsOfBondsNotesAndDebentures_f02f6029-6490-4aba-ad80-445067fe28f8_negatedTerseLabel_es" xlink:label="lab_ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reembolsos de obligaciones con y sin garantía y pagarés</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_RepaymentsOfBondsNotesAndDebentures"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:to="lab_ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_InterimDividend_dd2e5e66-85e5-4bce-b3d4-3c05cb767ca3_terseLabel_es" xlink:label="lab_mer_InterimDividend" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interim dividend</link:label>
    <link:label id="lab_mer_InterimDividend_label_es" xlink:label="lab_mer_InterimDividend" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interim dividend</link:label>
    <link:label id="lab_mer_InterimDividend_documentation_es" xlink:label="lab_mer_InterimDividend" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The amount of interim dividend.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_InterimDividend" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_InterimDividend"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_InterimDividend" xlink:to="lab_mer_InterimDividend" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod_ebf10ec3-866c-41c9-a434-25d38a755629_terseLabel_es" xlink:label="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:to="lab_ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InventoriesTotal_87abbacc-6a8e-4214-b814-e306dc9791c4_terseLabel_es" xlink:label="lab_ifrs-full_InventoriesTotal" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Inventories</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InventoriesTotal" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_InventoriesTotal"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InventoriesTotal" xlink:to="lab_ifrs-full_InventoriesTotal" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentProvisions_80b16b5d-424b-4ad3-bf2c-da12665b1eea_terseLabel_es" xlink:label="lab_ifrs-full_CurrentProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Current provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentProvisions" xlink:to="lab_ifrs-full_CurrentProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_LegalFormOfEntity_c8b81314-b9e3-4448-903c-29a593111be6_terseLabel_es" xlink:label="lab_ifrs-full_LegalFormOfEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Legal form of entity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LegalFormOfEntity" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_LegalFormOfEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_LegalFormOfEntity" xlink:to="lab_ifrs-full_LegalFormOfEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_733f57e0-8f99-431f-98f7-038b29a15641_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of financial risk management [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:to="lab_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromSalesOfInvestmentProperty_cdccf271-21e2-421b-ac38-2c2b995b42ca_negatedTerseLabel_es" xlink:label="lab_ifrs-full_ProceedsFromSalesOfInvestmentProperty" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of investment property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInvestmentProperty" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProceedsFromSalesOfInvestmentProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromSalesOfInvestmentProperty" xlink:to="lab_ifrs-full_ProceedsFromSalesOfInvestmentProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_PaymentsForInvestments_ddec3da7-17ef-4d03-9ef3-280a1a8573bf_negatedTotalLabel_es" xlink:label="lab_mer_PaymentsForInvestments" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Payments for investments</link:label>
    <link:label id="lab_mer_PaymentsForInvestments_label_es" xlink:label="lab_mer_PaymentsForInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Payments for investments</link:label>
    <link:label id="lab_mer_PaymentsForInvestments_documentation_es" xlink:label="lab_mer_PaymentsForInvestments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Payments for investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_PaymentsForInvestments" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_PaymentsForInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_PaymentsForInvestments" xlink:to="lab_mer_PaymentsForInvestments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncome_0775c77a-c08f-4ff0-932d-a5d0e6d2226b_totalLabel_es" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total comprehensive income</link:label>
    <link:label id="lab_ifrs-full_ComprehensiveIncome_bf134e44-2e5a-44f9-ae18-579027fe4ed5_terseLabel_es" xlink:label="lab_ifrs-full_ComprehensiveIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Comprehensive income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncome" xlink:to="lab_ifrs-full_ComprehensiveIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_83d9d9be-e17e-42ef-ac73-9d6194b4ff39_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of trade and other payables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfOperatingLeasesTextBlock_bacce48c-854c-4460-bd8a-6e3d40aea93d_terseLabel_es" xlink:label="lab_mer_DisclosureOfOperatingLeasesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of operating leases [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfOperatingLeasesTextBlock_label_es" xlink:label="lab_mer_DisclosureOfOperatingLeasesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of operating leases [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfOperatingLeasesTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfOperatingLeasesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The entire disclosure for operating leases.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfOperatingLeasesTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfOperatingLeasesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfOperatingLeasesTextBlock" xlink:to="lab_mer_DisclosureOfOperatingLeasesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_b8a5b675-d406-42bd-aab9-27011b328d0b_terseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for depreciation and amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:to="lab_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory_83abbb74-d235-4d17-abca-0ed4fce32866_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of other liabilities [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfOtherLiabilitiesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentFinancialAssets_c97d49d5-1dc4-49bc-9618-c92a37575727_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Non-current financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentFinancialAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncurrentFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentFinancialAssets" xlink:to="lab_ifrs-full_NoncurrentFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_37ad3c85-2db2-4bb3-b5c4-5edc19e7ce47_totalLabel_es" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash flows from (used in) operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncontrollingInterestsMember_c96edf6c-79d9-48af-940e-efc29664ed50_terseLabel_es" xlink:label="lab_ifrs-full_NoncontrollingInterestsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Non-controlling interests [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncontrollingInterestsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncontrollingInterestsMember" xlink:to="lab_ifrs-full_NoncontrollingInterestsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComponentsOfEquityAxis_051baaee-2ebc-42ab-abf3-2ef754e80cea_terseLabel_es" xlink:label="lab_ifrs-full_ComponentsOfEquityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Components of equity [axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis" xlink:to="lab_ifrs-full_ComponentsOfEquityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BasicAndDilutedEarningsLossPerShare_cb2c93db-2ebb-4ac1-a1c1-bd2b45020637_terseLabel_es" xlink:label="lab_ifrs-full_BasicAndDilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancias (pérdidas) por acción básicas y diluidas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicAndDilutedEarningsLossPerShare" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_BasicAndDilutedEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BasicAndDilutedEarningsLossPerShare" xlink:to="lab_ifrs-full_BasicAndDilutedEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock_b19617a8-18d4-4695-86e6-499867496bd0_terseLabel_es" xlink:label="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of basis of preparation of financial statements and basis of consolidation [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock_label_es" xlink:label="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of basis of preparation of financial statements and basis of consolidation [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The disclosure of the basis used for the preparation of the financial statements and the disclosure of the basis used for consolidation.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfBasisOfPreparationOfFinancialStatementsAndBasisOfConsolidationTextBlock"/>
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    <link:label id="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_c906bb0f-9d31-40e1-8af4-4b9bb828d075_negatedTerseLabel_es" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Repayments of borrowings, classified as financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
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    <link:label id="lab_ifrs-full_CurrentLiabilities_9395b7e5-b3c5-44d7-8520-9a5dd14bc1d8_totalLabel_es" xlink:label="lab_ifrs-full_CurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentLiabilities" xlink:to="lab_ifrs-full_CurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherReversalsOfProvisions_2c375755-686c-47d5-88ca-414217d26ed5_terseLabel_es" xlink:label="lab_ifrs-full_OtherReversalsOfProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other reversals of provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReversalsOfProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherReversalsOfProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherReversalsOfProvisions" xlink:to="lab_ifrs-full_OtherReversalsOfProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock_3d7b2341-7b15-440c-8cc5-002e6e8771a9_terseLabel_es" xlink:label="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of the information on the environment [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock_label_es" xlink:label="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of the information on the environment [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The disclosure of the information on the environment.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:to="lab_mer_DisclosureOfTheInformationOnTheEnvironmentTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherIncome_7f337cd2-fcb6-448c-b73e-84391b532efc_terseLabel_es" xlink:label="lab_ifrs-full_OtherIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherIncome" xlink:to="lab_ifrs-full_OtherIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfEquityTextBlock_0b4641d6-a23c-433f-b42f-98923107ce59_terseLabel_es" xlink:label="lab_mer_DisclosureOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of Equity [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfEquityTextBlock_label_es" xlink:label="lab_mer_DisclosureOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of Equity [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfEquityTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfEquityTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The entire disclosure for share capital, reserves, other equity interest and earnings per share.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfEquityTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfEquityTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfEquityTextBlock" xlink:to="lab_mer_DisclosureOfEquityTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_ce096a79-56b6-4e2d-9dcd-bafef4edae72_terseLabel_es" xlink:label="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Reserve of exchange differences on translation [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:to="lab_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceIncome_8c721ce5-0e65-4e1a-9230-f428684ded4e_terseLabel_es" xlink:label="lab_ifrs-full_FinanceIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Finance income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_FinanceIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceIncome" xlink:to="lab_ifrs-full_FinanceIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssets_ae843def-3f5b-4f73-b365-e5bee782dddb_totalLabel_es" xlink:label="lab_ifrs-full_CurrentAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssets" xlink:to="lab_ifrs-full_CurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent_a42e4b34-a271-4f1d-99a7-7eaa4ebcd38c_totalLabel_es" xlink:label="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss), attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeAbstract_1da64705-6c49-490b-ae45-7c4e7b41695e_terseLabel_es" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other comprehensive income [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherComprehensiveIncomeAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherAdjustmentsToReconcileProfitLoss_ce867e0e-b251-45ad-82e2-dc243d717fe6_terseLabel_es" xlink:label="lab_ifrs-full_OtherAdjustmentsToReconcileProfitLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Otros ajustes para conciliar la ganancia (pérdida)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherAdjustmentsToReconcileProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss" xlink:to="lab_ifrs-full_OtherAdjustmentsToReconcileProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForProvisions_1a428402-9416-4b4a-b71c-8951c88c30b6_terseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForProvisions" xlink:to="lab_ifrs-full_AdjustmentsForProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PropertyPlantAndEquipment_b2da563c-c119-43ec-ae9a-21f93a8de6b8_terseLabel_es" xlink:label="lab_ifrs-full_PropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PropertyPlantAndEquipment" xlink:to="lab_ifrs-full_PropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentAssetsAbstract_26b82583-5255-4e67-bb8a-4c78d0930ad9_terseLabel_es" xlink:label="lab_ifrs-full_CurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Current assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CurrentAssetsAbstract" xlink:to="lab_ifrs-full_CurrentAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_PurchaseOfFinancialAssets_3ac492f0-2229-49eb-8de5-03179ef71f93_negatedTerseLabel_es" xlink:label="lab_mer_PurchaseOfFinancialAssets" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Purchase of financial assets</link:label>
    <link:label id="lab_mer_PurchaseOfFinancialAssets_label_es" xlink:label="lab_mer_PurchaseOfFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Purchase of financial assets</link:label>
    <link:label id="lab_mer_PurchaseOfFinancialAssets_documentation_es" xlink:label="lab_mer_PurchaseOfFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The cash outflow for the purchase of financial assets.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_PurchaseOfFinancialAssets" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_PurchaseOfFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_PurchaseOfFinancialAssets" xlink:to="lab_mer_PurchaseOfFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract_3c52b442-c045-4179-88f9-3f625f4d17c7_terseLabel_es" xlink:label="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Analysis of income and expense [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AnalysisOfIncomeAndExpenseAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:to="lab_ifrs-full_AnalysisOfIncomeAndExpenseAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives_5c8d6bd3-a0b1-4138-8af1-bad71cd14669_terseLabel_es" xlink:label="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Gains losses on change in fair value of embeded derivatives</link:label>
    <link:label id="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives_label_es" xlink:label="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Gains losses on change in fair value of embeded derivatives</link:label>
    <link:label id="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives_documentation_es" xlink:label="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Gains losses on change in fair value of embeded derivatives</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:to="lab_mer_GainsLossesOnChangeInFairValueOfEmbededDerivatives" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Revenue_8e3499da-d1f1-44ec-96b3-6bbfb6a28f23_terseLabel_es" xlink:label="lab_ifrs-full_Revenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_Revenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Revenue" xlink:to="lab_ifrs-full_Revenue" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty_360931c7-6ede-4104-abaa-affca26e5e5a_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for gains (losses) on fair value adjustment, investment property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:to="lab_ifrs-full_AdjustmentsForGainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_dca1e337-d4c2-4d3d-a3e8-059244cf0ef0_totalLabel_es" xlink:label="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Comprehensive income, attributable to owners of parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:to="lab_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityAbstract_d2c7d1f8-ac35-4d4e-93af-935006e14980_terseLabel_es" xlink:label="lab_ifrs-full_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Equity [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_EquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityAbstract" xlink:to="lab_ifrs-full_EquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EmployeeBenefitsExpense_0b55de9d-235f-445d-ba0a-82d1e6c5d56f_negatedTerseLabel_es" xlink:label="lab_ifrs-full_EmployeeBenefitsExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Employee benefits expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EmployeeBenefitsExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_EmployeeBenefitsExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EmployeeBenefitsExpense" xlink:to="lab_ifrs-full_EmployeeBenefitsExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory_f5c74927-ba0b-4012-a78e-8ffeec8ae49f_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of investments accounted for using equity method [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NameOfParentEntity_fc691e07-37af-435c-9530-5d9c4d35f53c_terseLabel_es" xlink:label="lab_ifrs-full_NameOfParentEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Name of parent entity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfParentEntity" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NameOfParentEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NameOfParentEntity" xlink:to="lab_ifrs-full_NameOfParentEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLossFromOperatingActivities_11735522-bea4-478c-a59e-636e13754588_totalLabel_es" xlink:label="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) from operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLossFromOperatingActivities" xlink:to="lab_ifrs-full_ProfitLossFromOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ChangeInFairValueOfFinancialInstruments_fff9db73-881f-41da-839b-4dbf5575c049_totalLabel_es" xlink:label="lab_mer_ChangeInFairValueOfFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of financial instruments</link:label>
    <link:label id="lab_mer_ChangeInFairValueOfFinancialInstruments_label_es" xlink:label="lab_mer_ChangeInFairValueOfFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of financial instruments</link:label>
    <link:label id="lab_mer_ChangeInFairValueOfFinancialInstruments_documentation_es" xlink:label="lab_mer_ChangeInFairValueOfFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of financial instruments.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ChangeInFairValueOfFinancialInstruments" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ChangeInFairValueOfFinancialInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ChangeInFairValueOfFinancialInstruments" xlink:to="lab_mer_ChangeInFairValueOfFinancialInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock_99d15774-e0bd-4f65-92d1-76c7e4a6d834_terseLabel_es" xlink:label="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of distribution of profit of the Parent [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock_label_es" xlink:label="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of distribution of profit of the Parent [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The disclosure of the distribution of profit of the Parent.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:to="lab_mer_DisclosureOfDistributionOfProfitOfTheParentTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_4288b9d8-3054-4a57-a398-d6f2b57e2f1c_terseLabel_es" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Otro resultado global, neto de impuestos, coberturas de flujos de efectivo</link:label>
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    <link:label id="lab_ifrs-full_IncomeTaxExpenseContinuingOperations_1a7e25bb-cd53-4789-bf8b-8c224f0d5a1a_negatedTerseLabel_es" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Tax expense (income)</link:label>
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    <link:label id="lab_mer_ProfitLossAttributableToOwnersOfParentMember_ed672a20-9264-4261-9242-4e1660effc9a_terseLabel_es" xlink:label="lab_mer_ProfitLossAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit Loss Attributable To Owners Of Parent [Member]</link:label>
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    <link:label id="lab_mer_ProfitLossAttributableToOwnersOfParentMember_documentation_es" xlink:label="lab_mer_ProfitLossAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">This member stands for a component of equity representing Profit Loss Attributable To Owners Of Parent</link:label>
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    <link:label id="lab_ifrs-full_AdjustmentsForFinanceIncome_b49bdd6d-38f9-4b55-91ec-17bfb55d2a71_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForFinanceIncome" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for finance income</link:label>
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    <link:label id="lab_ifrs-full_EquityAttributableToOwnersOfParentMember_3895efb8-65bb-499b-8a34-9fbf21da704b_terseLabel_es" xlink:label="lab_ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Equity attributable to owners of parent [member]</link:label>
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    <link:label id="lab_ifrs-full_StatementOfChangesInEquityTable_f59fc6b8-13a1-4d21-bcd0-b45ea16bc1f4_terseLabel_es" xlink:label="lab_ifrs-full_StatementOfChangesInEquityTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Statement of changes in equity [table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
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    <link:label id="lab_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_12648ccc-4d53-47fe-bff0-9bd7b490d317_terseLabel_es" xlink:label="lab_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Description of nature of entity's operations and principal activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"/>
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    <link:label id="lab_ifrs-full_CountryOfIncorporation_79548ac3-5410-4616-9c23-7ce12614d18c_terseLabel_es" xlink:label="lab_ifrs-full_CountryOfIncorporation" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Country of incorporation</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfIncorporation" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CountryOfIncorporation"/>
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    <link:label id="lab_mer_DisclosureOfPublicEntitiesAndIncomeTaxTextBlock_ecc113a9-e80b-4fba-bcb6-e12739748f4f_terseLabel_es" xlink:label="lab_mer_DisclosureOfPublicEntitiesAndIncomeTaxTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of Public entities and income tax [Text Block]</link:label>
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    <link:label id="lab_mer_DisclosureOfPublicEntitiesAndIncomeTaxTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfPublicEntitiesAndIncomeTaxTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The entire disclosure of public entities and income taxes.</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfFinancialLiabilitiesExplanatory_681f63b4-e45c-44e4-8c4e-3f66a428b1a5_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfFinancialLiabilitiesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of financial liabilities [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialLiabilitiesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfFinancialLiabilitiesExplanatory"/>
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    <link:label id="lab_mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations_c5cf034d-a3d8-4d0b-b901-7aabbdfdfc7f_negatedTerseLabel_es" xlink:label="lab_mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancia reconocida en una transacción de compra en condiciones muy ventajosas</link:label>
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    <link:label id="lab_mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations_documentation_es" xlink:label="lab_mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for negative difference on business combinations recognized in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_AdjustmentsForNegativeDifferenceOnBusinessCombinations"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_8191832a-ac8a-406a-a362-5fac60c96a8a_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for undistributed profits of investments accounted for using equity method</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod"/>
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    <link:label id="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_8b4a5e26-3c6f-442c-94ea-1fb3a7c60334_terseLabel_es" xlink:label="lab_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interest received</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities"/>
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    <link:label id="lab_ifrs-full_NoncurrentLiabilitiesAbstract_0d556228-8cc9-4a2d-85cb-94ea085fc5f8_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Non-current liabilities [abstract]</link:label>
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    <link:label id="lab_mer_ProceedsFromSalesOfFinancialAssets_e584405a-b99f-4937-980a-45db8b422025_terseLabel_es" xlink:label="lab_mer_ProceedsFromSalesOfFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of financial assets</link:label>
    <link:label id="lab_mer_ProceedsFromSalesOfFinancialAssets_label_es" xlink:label="lab_mer_ProceedsFromSalesOfFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from sales of financial assets</link:label>
    <link:label id="lab_mer_ProceedsFromSalesOfFinancialAssets_documentation_es" xlink:label="lab_mer_ProceedsFromSalesOfFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The cash inflow from sales of financial assets.</link:label>
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    <link:label id="lab_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory_08b7adc8-61c0-4f00-804c-af14b703b309_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of notes and other explanatory information [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory"/>
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    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_a4750857-4452-4348-8b0e-e1d4da655b11_totalLabel_es" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) before tax</link:label>
    <link:label id="lab_ifrs-full_ProfitLossBeforeTax_ab54811d-d8cf-43ce-952d-2fafd01010d0_terseLabel_es" xlink:label="lab_ifrs-full_ProfitLossBeforeTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) before tax</link:label>
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    <link:label id="lab_ifrs-full_EquityAndLiabilitiesAbstract_ca749ead-f7a4-4a69-81c0-c3f0418dfb3b_terseLabel_es" xlink:label="lab_ifrs-full_EquityAndLiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Equity and liabilities [abstract]</link:label>
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    <link:label id="lab_ifrs-full_TreasurySharesMember_f57c8aab-6b9f-4587-a31a-539ef97901cc_terseLabel_es" xlink:label="lab_ifrs-full_TreasurySharesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Treasury shares [member]</link:label>
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    <link:label id="lab_ifrs-full_IssuedCapitalMember_02f1c109-0372-4179-bbc4-c0caf64873f9_terseLabel_es" xlink:label="lab_ifrs-full_IssuedCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Issued capital [member]</link:label>
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    <link:label id="lab_ifrs-full_DeferredTaxLiabilities_6c6033c6-0a35-46a1-bb7e-20f15fbccec6_terseLabel_es" xlink:label="lab_ifrs-full_DeferredTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Deferred tax liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DeferredTaxLiabilities"/>
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    <link:label id="lab_ifrs-full_DividendsPaid_af3e6aeb-88a1-450a-972c-7cbf95a9bdd5_terseLabel_es" xlink:label="lab_ifrs-full_DividendsPaid" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Dividends recognised as distributions to owners</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DividendsPaid"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DividendsPaid" xlink:to="lab_ifrs-full_DividendsPaid" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfInvestments_d13cdbc1-eec4-4323-ba41-50c9db2de692_terseLabel_es" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfInvestments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Gains (losses) on disposals of investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfInvestments" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_GainsLossesOnDisposalsOfInvestments"/>
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    <link:label id="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_9c200794-0d52-4bae-b446-828c72b8b513_negatedTerseLabel_es" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Flujos de efectivo utilizados en la obtención de control de dependientes u otros negocios, clasificados como actividades de inversión</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
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    <link:label id="lab_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_50c6cc61-88b2-404e-bd15-cd47f17ef48a_terseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for losses (gains) on disposal of non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:to="lab_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentFinancialLiabilities_4bfa38c1-b80c-482b-b9fb-85bc53430f58_terseLabel_es" xlink:label="lab_ifrs-full_OtherCurrentFinancialLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other current financial liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentFinancialLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherCurrentFinancialLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentFinancialLiabilities" xlink:to="lab_ifrs-full_OtherCurrentFinancialLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProfitLoss_b4cf2659-f176-40f5-a72e-33fa7b2b4f2f_totalLabel_es" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss)</link:label>
    <link:label id="lab_ifrs-full_ProfitLoss_56723006-c842-4ab3-b1c8-79498e611e13_terseLabel_es" xlink:label="lab_ifrs-full_ProfitLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancia (pérdida)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProfitLoss" xlink:to="lab_ifrs-full_ProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_ff73a23f-9dee-4efb-815b-0b9b3be47c06_negatedTerseLabel_es" xlink:label="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Proceeds from borrowings</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_6463703a-c190-4233-a27e-b640e9cfa968_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of trade and other receivables [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:to="lab_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived_2661ec1b-488a-41d9-abac-ea68c88537cd_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Parte no corriente de préstamos no corrientes recibidos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived"/>
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    <link:label id="lab_ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities_58176ec8-e69a-4899-86a0-7a9f1f9259d0_negatedTerseLabel_es" xlink:label="lab_ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Income taxes paid, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities"/>
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    <link:label id="lab_ifrs-full_CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued_7b5ca7f3-be93-462a-9760-8abcfe052963_terseLabel_es" xlink:label="lab_ifrs-full_CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Bonos corrientes emitidos y parte corriente de bonos no corrientes emitidos</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued"/>
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    <link:label id="lab_ifrs-full_OtherIntangibleAssets_4375059e-cd8b-4bea-82a1-0feb8ef773c9_terseLabel_es" xlink:label="lab_ifrs-full_OtherIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other intangible assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIntangibleAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherIntangibleAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherIntangibleAssets" xlink:to="lab_ifrs-full_OtherIntangibleAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_BasicEarningsLossPerShare_d7d4ff4a-c3d1-42d1-b1b6-068474c43f48_terseLabel_es" xlink:label="lab_ifrs-full_BasicEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Basic earnings (loss) per share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_BasicEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_BasicEarningsLossPerShare" xlink:to="lab_ifrs-full_BasicEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_e75e4c1f-f09d-49fd-b2c5-c1b7948fd850_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of information about key management personnel [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_SubtotalNonCurrentFinancialAssets_6f561c0c-6716-4412-9801-60b8ba9eb528_totalLabel_es" xlink:label="lab_mer_SubtotalNonCurrentFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Subtotal non current financial assets</link:label>
    <link:label id="lab_mer_SubtotalNonCurrentFinancialAssets_label_es" xlink:label="lab_mer_SubtotalNonCurrentFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Subtotal non current financial assets</link:label>
    <link:label id="lab_mer_SubtotalNonCurrentFinancialAssets_documentation_es" xlink:label="lab_mer_SubtotalNonCurrentFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Subtotal non current financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_SubtotalNonCurrentFinancialAssets" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_SubtotalNonCurrentFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_SubtotalNonCurrentFinancialAssets" xlink:to="lab_mer_SubtotalNonCurrentFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_4d2d3aae-80ef-4882-94d3-dedfe872924a_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for increase (decrease) in trade and other payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:to="lab_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DepreciationAndAmortisationExpense_5a1699cf-9514-4718-b3c3-cce17f9a1fa2_negatedTerseLabel_es" xlink:label="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Depreciation and amortisation expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAndAmortisationExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DepreciationAndAmortisationExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DepreciationAndAmortisationExpense" xlink:to="lab_ifrs-full_DepreciationAndAmortisationExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_TradeAndOtherCurrentPayables_c0944670-7984-407a-b293-076ec05efc1a_terseLabel_es" xlink:label="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Trade and other current payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_TradeAndOtherCurrentPayables" xlink:to="lab_ifrs-full_TradeAndOtherCurrentPayables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_StatementOfChangesInEquityLineItems_fda37f5c-f860-4fcc-8895-9a924cf1e751_terseLabel_es" xlink:label="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Statement of changes in equity [line items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems" xlink:to="lab_ifrs-full_StatementOfChangesInEquityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentAssetsAbstract_23caa7c1-3e56-4003-8c88-9596f9fec2e5_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Non-current assets [abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncurrentAssetsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentAssetsAbstract" xlink:to="lab_ifrs-full_NoncurrentAssetsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod_f16cfebb-f967-4773-9743-1d75e3a0e11a_terseLabel_es" xlink:label="lab_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Explicación del cambio en el nombre de la entidad que informa u otras formas de identificación desde el final del ejercicio sobre el que se informa precedente</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:to="lab_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets_c8dfd3f5-4d2f-42c4-9952-0724035ab20d_terseLabel_es" xlink:label="lab_ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInWorkingCapital_63344182-c5a4-43d5-bff6-adcf1cf65d7f_negatedTotalLabel_es" xlink:label="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Increase (decrease) in working capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital"/>
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    <link:label id="lab_ifrs-full_GainsLossesOnDisposalsOfInvestmentProperties_4eb0eaf5-60fe-4bd7-a057-ec233a69ebdb_terseLabel_es" xlink:label="lab_ifrs-full_GainsLossesOnDisposalsOfInvestmentProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancias (pérdidas) por la enajenación o disposición por otra vía de inversiones inmobiliarias</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfInvestmentProperties" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_GainsLossesOnDisposalsOfInvestmentProperties"/>
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    <link:label id="lab_ifrs-full_OtherCurrentLiabilities_8b6215ab-fdcb-42d0-add2-5628f6592aee_terseLabel_es" xlink:label="lab_ifrs-full_OtherCurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherCurrentLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentLiabilities" xlink:to="lab_ifrs-full_OtherCurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities_d3340830-0814-4a56-9339-4efda7a8a08b_negatedTerseLabel_es" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interest paid, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:to="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_a103d917-f888-4dcf-a8ea-8d17eb014b88_terseLabel_es" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Increase (decrease) through share-based payment transactions, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
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    <link:label id="lab_ifrs-full_DomicileOfEntity_b59568bd-9cb2-4606-8857-7ece35343a84_terseLabel_es" xlink:label="lab_ifrs-full_DomicileOfEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Domicile of entity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DomicileOfEntity" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DomicileOfEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DomicileOfEntity" xlink:to="lab_ifrs-full_DomicileOfEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_8154c6df-e773-423c-b173-d8b57db70996_negatedTerseLabel_es" xlink:label="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Purchase of property, plant and equipment, classified as investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IssuedCapital_00ad0a59-1a47-484a-b583-6b3e97046279_terseLabel_es" xlink:label="lab_ifrs-full_IssuedCapital" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Issued capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IssuedCapital" xlink:to="lab_ifrs-full_IssuedCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_bfb36489-ddbf-4fa5-b440-cd69685cd2c6_terseLabel_es" xlink:label="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other comprehensive income that will be reclassified to profit or loss, net of tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="lab_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentProvisions_37775ca3-0499-4624-849e-150184fb3e39_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentProvisions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Non-current provisions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentProvisions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncurrentProvisions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentProvisions" xlink:to="lab_ifrs-full_NoncurrentProvisions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InvestmentProperty_55cda52a-b0c7-4c5e-bf03-610ab8dd1320_terseLabel_es" xlink:label="lab_ifrs-full_InvestmentProperty" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Investment property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentProperty" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_InvestmentProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_InvestmentProperty" xlink:to="lab_ifrs-full_InvestmentProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfRevenueAndExpensesTextBlock_c9356f23-bee0-4d65-8c25-b21c9e52ef1a_terseLabel_es" xlink:label="lab_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of revenue and expenses [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfRevenueAndExpensesTextBlock_label_es" xlink:label="lab_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of revenue and expenses [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfRevenueAndExpensesTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The entire disclosure for revenue and expenses.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfRevenueAndExpensesTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:to="lab_mer_DisclosureOfRevenueAndExpensesTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty_a157ddd5-056b-40d3-8467-77797d5a0442_terseLabel_es" xlink:label="lab_ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Gains (losses) on fair value adjustment, investment property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:to="lab_ifrs-full_GainsLossesOnFairValueAdjustmentInvestmentProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForReconcileProfitLoss_a8af2dcc-56db-40e9-ae12-e3b355cf710c_totalLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForReconcileProfitLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total adjustments to reconcile profit (loss)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForReconcileProfitLoss" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForReconcileProfitLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForReconcileProfitLoss" xlink:to="lab_ifrs-full_AdjustmentsForReconcileProfitLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_PaymentsOfOtherEquityInstruments_bb18d0ac-7615-4fdf-b154-e62b6492cdf4_negatedTerseLabel_es" xlink:label="lab_ifrs-full_PaymentsOfOtherEquityInstruments" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Payments of other equity instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfOtherEquityInstruments" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_PaymentsOfOtherEquityInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsOfOtherEquityInstruments" xlink:to="lab_ifrs-full_PaymentsOfOtherEquityInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_80355374-906b-499e-9ef2-699e23ce48db_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for decrease (increase) in trade and other receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_EquityMember_a3699e75-aaca-4bb0-9f6b-fb1be28dcf12_terseLabel_es" xlink:label="lab_ifrs-full_EquityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Equity [member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityMember" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_EquityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_EquityMember" xlink:to="lab_ifrs-full_EquityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ChangeInFairValueOfOtherFinancialInstruments_e609bf83-ce82-4380-8f78-3f5f84de0877_terseLabel_es" xlink:label="lab_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of other financial instruments</link:label>
    <link:label id="lab_mer_ChangeInFairValueOfOtherFinancialInstruments_label_es" xlink:label="lab_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of other financial instruments</link:label>
    <link:label id="lab_mer_ChangeInFairValueOfOtherFinancialInstruments_documentation_es" xlink:label="lab_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Change in fair value of other financial instruments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ChangeInFairValueOfOtherFinancialInstruments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:to="lab_mer_ChangeInFairValueOfOtherFinancialInstruments" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentLiabilities_ac27ce70-1ecd-46bd-af73-795b47e9c977_totalLabel_es" xlink:label="lab_ifrs-full_NoncurrentLiabilities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total non-current liabilities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentLiabilities" xlink:to="lab_ifrs-full_NoncurrentLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory_62e635e9-cd65-4b84-a667-a21e48f6a1ae_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of auditors' remuneration [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:to="lab_ifrs-full_DisclosureOfAuditorsRemunerationExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_ProfitLossAttributableToOwnersOfTheParent_43921a7f-73a0-4d53-a3ef-20b333b657fa_terseLabel_es" xlink:label="lab_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) attributable to owners of the parent</link:label>
    <link:label id="lab_mer_ProfitLossAttributableToOwnersOfTheParent_label_es" xlink:label="lab_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) attributable to owners of the parent</link:label>
    <link:label id="lab_mer_ProfitLossAttributableToOwnersOfTheParent_documentation_es" xlink:label="lab_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Profit (loss) attributable to owners of the parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_ProfitLossAttributableToOwnersOfTheParent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:to="lab_mer_ProfitLossAttributableToOwnersOfTheParent" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_OtherEquityHolderContributions_345de3d7-da8a-4c03-aa81-7a21bc72f30c_terseLabel_es" xlink:label="lab_mer_OtherEquityHolderContributions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions</link:label>
    <link:label id="lab_mer_OtherEquityHolderContributions_label_es" xlink:label="lab_mer_OtherEquityHolderContributions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions</link:label>
    <link:label id="lab_mer_OtherEquityHolderContributions_documentation_es" xlink:label="lab_mer_OtherEquityHolderContributions" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_OtherEquityHolderContributions" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_OtherEquityHolderContributions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_OtherEquityHolderContributions" xlink:to="lab_mer_OtherEquityHolderContributions" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DilutedEarningsLossPerShare_b2b8aeac-8b2e-4b36-b669-907a90cb5ee1_terseLabel_es" xlink:label="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Ganancias (pérdidas) por acción diluidas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DilutedEarningsLossPerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DilutedEarningsLossPerShare" xlink:to="lab_ifrs-full_DilutedEarningsLossPerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions_0b1dd967-dede-40e6-b37c-df872a76fe85_terseLabel_es" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Increase (decrease) through treasury share transactions, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions" xlink:to="lab_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_InterimDividendMember_f05ec4b7-f1c6-4f83-9508-19cbdd265540_terseLabel_es" xlink:label="lab_mer_InterimDividendMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interim dividend [Member]</link:label>
    <link:label id="lab_mer_InterimDividendMember_label_es" xlink:label="lab_mer_InterimDividendMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Interim dividend [Member]</link:label>
    <link:label id="lab_mer_InterimDividendMember_documentation_es" xlink:label="lab_mer_InterimDividendMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">This member stands for the interim dividends.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_InterimDividendMember" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_InterimDividendMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_InterimDividendMember" xlink:to="lab_mer_InterimDividendMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued_8e133060-f868-4798-bbd2-240c9e7d20e3_terseLabel_es" xlink:label="lab_ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Parte no corriente de bonos emitidos no corrientes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued" xlink:to="lab_ifrs-full_NoncurrentPortionOfNoncurrentBondsIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_OtherCurrentFinancialAssets_9e97997a-74a4-4485-8b3b-85105e4857f0_terseLabel_es" xlink:label="lab_ifrs-full_OtherCurrentFinancialAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other current financial assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentFinancialAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_OtherCurrentFinancialAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_OtherCurrentFinancialAssets" xlink:to="lab_ifrs-full_OtherCurrentFinancialAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AddressOfRegisteredOfficeOfEntity_d57cd98b-cbf1-4328-9032-714e4d05c9da_terseLabel_es" xlink:label="lab_ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Address of entity's registered office</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:to="lab_ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfInvestmentPropertyExplanatory_3c9e887a-8d3a-4191-ac95-9f3e1f6896ed_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfInvestmentPropertyExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of investment property [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfInvestmentPropertyExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfInvestmentPropertyExplanatory" xlink:to="lab_ifrs-full_DisclosureOfInvestmentPropertyExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_9eeb7c09-8beb-4159-9ab8-9e05c4f7ddb0_negatedTotalLabel_es" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash flows from (used in) investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_Assets_19dcb2d7-d41a-4603-9dea-0895c2a95941_totalLabel_es" xlink:label="lab_ifrs-full_Assets" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Total assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_Assets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_Assets" xlink:to="lab_ifrs-full_Assets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory_65b2f0de-f38a-48fa-9f2f-93430f746ec3_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of general information about financial statements [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:to="lab_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_d805486d-6897-446d-bc9f-e4c971cc1912_negatedTerseLabel_es" xlink:label="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Adjustments for decrease (increase) in other current assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:to="lab_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperations_3bda87ea-8e56-443e-9986-53032f77d7fa_negatedTotalLabel_es" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Cash flows from (used in) operations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperations" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperations" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_afe56d2f-ba1b-4b89-9f49-41441a09391d_terseLabel_es" xlink:label="lab_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Name of reporting entity or other means of identification</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:to="lab_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory_c1128d61-d5de-474a-a4e4-b76bfc5fa97e_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of related party [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:to="lab_ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_OtherEquityHolderContributionsMember_1f16497c-2bd0-4732-9b04-4e83354cf677_terseLabel_es" xlink:label="lab_mer_OtherEquityHolderContributionsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions [Member]</link:label>
    <link:label id="lab_mer_OtherEquityHolderContributionsMember_label_es" xlink:label="lab_mer_OtherEquityHolderContributionsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions [Member]</link:label>
    <link:label id="lab_mer_OtherEquityHolderContributionsMember_documentation_es" xlink:label="lab_mer_OtherEquityHolderContributionsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Other equity holder contributions</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_OtherEquityHolderContributionsMember" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_OtherEquityHolderContributionsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_OtherEquityHolderContributionsMember" xlink:to="lab_mer_OtherEquityHolderContributionsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_FinanceCosts_ada0d879-c6cf-490e-a7a4-9108e5709984_negatedTerseLabel_es" xlink:label="lab_ifrs-full_FinanceCosts" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Finance costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_FinanceCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_FinanceCosts" xlink:to="lab_ifrs-full_FinanceCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock_2857f6ae-e7ca-4a37-ba21-821d993fa18f_terseLabel_es" xlink:label="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of changes in consolidation perimeter [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock_label_es" xlink:label="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of changes in consolidation perimeter [Text Block]</link:label>
    <link:label id="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock_documentation_es" xlink:label="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">The disclosure of the changes in the consolidation perimeter.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:href="959800L8KD863DP30X04-2020-12-31.xsd#mer_DisclosureOfChangesInConsolidationPerimeterTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:to="lab_mer_DisclosureOfChangesInConsolidationPerimeterTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_NameOfUltimateParentOfGroup_672e66e3-8c64-4f11-bdcd-c367615c5cc8_terseLabel_es" xlink:label="lab_ifrs-full_NameOfUltimateParentOfGroup" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Nombre de la dominante última del grupo</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfUltimateParentOfGroup" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_NameOfUltimateParentOfGroup"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_NameOfUltimateParentOfGroup" xlink:to="lab_ifrs-full_NameOfUltimateParentOfGroup" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DeferredTaxAssets_3a40c846-24d1-4fc8-8b19-a090c235a0ae_terseLabel_es" xlink:label="lab_ifrs-full_DeferredTaxAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Deferred tax assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DeferredTaxAssets" xlink:to="lab_ifrs-full_DeferredTaxAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_b20ebd3e-d0cb-4f92-9bba-d539ba4b1a4c_terseLabel_es" xlink:label="lab_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="es">Disclosure of events after reporting period [text block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"/>
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