Example image of eyePlorer eyePlorer map for 'Currency': Economics United States dollar Cheque Commodity money Fiat money Central bank Monopoly Exchange rate International trade Exchange rate regime Fixed exchange rate Floating currency Finance minister Federal Reserve System United States Western world Canadian dollar Euro Legal tender El Salvador Panama Currency board Ecuador Cent (currency) Centime Dollar Franc Penny (British decimal coin) Pound sterling Icelandic króna Iraimbilanja Khoums Madagascar Malagasy ariary Mauritania Mauritanian ouguiya Inflation Non-decimal currencies Medium of exchange Store of value Unit of account Ancient Egypt Mesopotamia Sumer Fertile Crescent Bahrain Bronze Age Crete Elam Minoan civilization