antigua argentina argentine currency board balance of payments barbuda bermudian dollar brunei dollar bulgaria bulgarian lev cayman islands dollar central bank currencies related to the euro danish krone deutsche mark djiboutian franc dollarization dominica east caribbean dollar economy of estonia estonia estonian kroon euro eurozone falkland islands falkland islands pound fixed exchange rate foreign exchange reserves gibraltar gibraltar pound grenada hard currency hong kong hong kong monetary authority hong kong dollar irish pound lender of last resort lithuania lithuanian litas macanese pataca monetary authority monetary base monetary policy pound sterling reserve requirement saint helena pound saint kitts and nevis saint lucia saint vincent and the grenadines singapore dollar united states dollar