currency:1 ** used as a medium of exchange,s**ing a tool of value and the unit of account.acts as an equivalent material service and exchange in goods.2 loans:only a bank or other financial institutions according to certain interest rate loans to customers,and must be within the period stipulated,repay the principal and interest of the loan.3,the balance of payments.:refers to a country's international payment rate,the rate of export and the rate of capital outflow balance ** zero.4 the interbank lending market:bank to short-term lending market funds.