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In macroeconomics, the money supply (or money stock) refers to the total volume of currency held by the public at a particular point in time. There are several ways to define "money", but standard measures usually include currency in circulation (i.e. physical cash) and demand deposits (depositors' easily accessed assets on the books of financial institutions). The central bank of a country may use a definition of what constitutes legal tender for its purposes. Money supply data is recorded and published, usually by a government agency or the central bank of the country. Public and private sector analysts monitor changes in the money supply because of the belief that such changes affect the price levels of securities, inflation, the exchange rates, and the business cycle. The relationship between money and prices has historically been associated with the quantity theory of money. There is some empirical evidence of a direct relationship between the growth of the money supply and long-term price inflation, at least for rapid increases in the amount of money in the economy. For example, a country such as Zimbabwe which saw extremely rapid increases in its money supply also saw extremely rapid increases in prices (hyperinflation). This is one reason for the reliance on monetary policy as a means of controlling inflation. Fractional-reserve banking Commercial banks play a role in the process of money creation, under the fractional-reserve banking system used throughout the world. In this system, credit is created whenever a bank gives out a new loan and destroyed when the borrower pays back the principal on the loan. This new money, in net terms, makes up the non-M0 component in the M1-M3 statistics. In short, there are two types of money in a fractional-reserve banking system: central bank money — obligations of a central bank, including currency and central bank depository accounts commercial bank money — obligations of commercial banks, including checking accounts and savings accounts.

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