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In page Republika Srpska:

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Republika Srpska, in monetary union with the Federation of Bosnia and Herzegovina, uses the Bosnia and Herzegovina convertible mark (KM). The currency is pegged to the euro at a unit rate of 1.95583 convertible marks. Along with the rest of Bosnia and Herzegovina, Republika Srpska is classified as an upper-middle income economy by the United Nations.[1] According to the IRBRS, the entity's development bank, Republika Srpska's nominal GDP per capita is 8,739 KM (€4,457) as of 2017.