Banks are closely concerned about the flow of money in to and out of the (1) ______ economy. They often cooperate with governments by efforts to stabilize economies (2) ______ and to prevent inflation. They are specialists in the business of providing capital. Banks originated as places in which people took their valuables for safe- (3) ______ keeping, but today the great banks of the world have many functions in addition to acting as guardians of valuable private possession. Banks normally receive money from their customers in two distinctive (4) ______ forms: on current account, and on deposit account. With a current account, a customer can issue personal cheques. No interest is paid by the bank on this type of account. With a deposit account, therefore, the customer undertakes (5) ______ to leave his money in the bank for a minimum specific period of time. Interest (6) ______ is paid on this money. The bank in return lends the deposited money to customers who need (7) ______ capital. This activity earns interest for the bank, and this interest is almost always at a higher rate than any interest which the bank provides to its (8) ______ deposits. In this way the bank makes its profit. We can say that the primary function of a bank today is to act for an (9) ______ intermediary between depositors who wish to make interest on their savings, and borrowers who wish to obtain capital. The bank is a reservoir of loanable money, with streams of money flowing in and out. For this reason, economists and financiers often talk of money being "liquid", or of the "liquidity" of money. Many small sums which might not thus be used as (10) ______ capital are tendered useful simply because the bank acts as a reservoir.