La política monetaria o política financiera es una rama de la política económica que usa la cantidad de dinero como variable para controlar y mantener la estabilidad económica. La política monetaria comprende las decisiones de las autoridades monetarias referidas al mercado de dinero, que modifican la cantidad de dinero o el tipo de interés. Cuando se aplica para aumentar la cantidad de dinero, se le denomina política monetaria expansiva, y cuando se aplica para reducirla, política monetaria restrictiva. Véanse también: Base monetaria, Oferta monetaria y Multiplicador monetario.

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Monetary policy is the process by which the monetary authority of a country controls the supply of money, often targeting an inflation rate or interest rate to ensure price stability and general trust in the currency. Further goals of a monetary policy are usually to contribute to economic growth and stability, to lower unemployment, and to maintain predictable exchange rates with other currencies. Monetary economics provides insight into how to craft optimal monetary policy. Monetary policy is referred to as either being expansionary or contractionary, where an expansionary policy increases the total supply of money in the economy more rapidly than usual, and contractionary policy expands the money supply more slowly than usual or even shrinks it. Expansionary policy is traditionally used to try to combat unemployment in a recession by lowering interest rates in the hope that easy credit will entice businesses into expanding. Contractionary policy is intended to slow inflation in order to avoid the resulting distortions and deterioration of asset value. Monetary policy differs from fiscal policy, which refers to taxation, government spending, and associated borrowing.

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