The total supply of money in circulation in a given country's economy at a given time. There are several measures for the money supply, such as M1, M2, and M3. The money supply is considered an important instrument for controlling inflation by those economists who say that growth in money supply will only lead to inflation if money demand is stable. In order to control the money supply, regulators have to decide which particular measure of the money supply to target. The broader the targeted measure, the more difficult it will be to control that particular target. However, targeting an unsuitable narrow money supply measure may lead to a situation where the total money supply in the country is not adequately controlled.

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