who controls the amount of money in circulation
Money creation Monetary policy regulates a country's money supply, the amount of broad currency in circulation. Almost all modern nations have central banks such as the United States Federal Reserve System, the European Central Bank (ECB), and the People's Bank of China for conducting monetary policy. Charged with the smooth functioning of the money supply and financial markets, these institutions are generally independent of the government executive.
Monetary policy of the United States Monetary policy concerns the actions of a central bank or other regulatory authorities that determine the size and rate of growth of the money supply. For example, in the United States, the Federal Reserve is in charge of monetary policy, and implements it primarily by performing operations that influence short-term interest rates.