“Unlike any good in the market, including a commodity money, whose quantities are ultimately determined by the interaction of supply and demand, the quantity of government fiat money (but not its purchasing power) at any point in time, is determined solely by decisions of suppliers of the good, i.e. government central banks, without respect to the desires and actions of the demanders” – http://mises.org/journals/aen/aen6_4_1.pdf
Monetary Choice
Learn how money works.