High Quality Content by WIKIPEDIA articles! The velocity of money (also called velocity of circulation) is the average frequency with which a unit of money is spent in a specific period of time. Velocity has to do with the amount of economic activity associated with a given money supply. When the period is understood, the velocity may be presented as a pure number; otherwise it should be given as a pure number over time. In the equation of exchange, velocity of money is one of the variables claimed to determine inflation.