According to Bannister and Forward (2002, page 28), Money supply growth and inflation are inexorably linked. M2 Money Stock; Federal Reserve Bank of St. Louis: M2 Money Stock since 1959; United States Census Bureau: Historical Statistics of the United States, Colonial Times to 1970 (M2 Money Stock until 1959, Chapter X, pages 992. May 28, 2021 The Fed Can 'Unprint' Money, Too. Expansive monetary policy can create inflation when it's overdone. The prices of assets increase as cheap capital chases fewer and fewer solid ventures. That's true whether the investments are in real estate, gold, oil, or stocks of high-tech companies.

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Chart showing the log of the velocity (green) of the U.S. M2,^[1]^[2] calculated by dividing nominal GDP by the M2 stock (M1 plus time deposits), 1959–2010. The employment-to-population ratio is displayed in blue, and periods of recession are represented with gray bars.

Similar chart showing the logged velocity (green) of a slightly narrower measure M1 of money consisting of currency and liquid deposits, 1959–2010.

Similar chart showing the logged velocity (green) of a broader measure of money M3 that covers M2 plus large institutional deposits. The US no longer publishes official M3 measures, so the chart only runs through 2005.

The velocity of money (or the velocity of circulation of money) is a measure of the number of times that the average unit of currency is used to purchase goods and services within a given time period.^[3] The concept relates the size of economic activity to a given money supply, and the speed of money exchange is one of the variables that determine inflation. The measure of the velocity of money is usually the ratio of the gross national product (GNP) to a country's money supply.

If the velocity of money is increasing, then transactions are occurring between individuals more frequently.^[3] The velocity of money changes over time and is influenced by a variety of factors.^[4]

Illustration[edit]

If, for example, in a very small economy, a farmer and a mechanic, with just $50 between them, buy new goods and services from each other in just three transactions over the course of a year

A farmer spends $50 on tractor repair from a mechanic.
The mechanic buys $40 of corn from the farmer.
The mechanic spends $10 on barn cats from the farmer.

then $100 changed hands in the course of a year, even though there is only $50 in this little economy. That $100 level is possible because each dollar was spent on new goods and services an average of twice a year, which is to say that the velocity was ${displaystyle 2/{text{year}}}$ . Note that if the farmer bought a used tractor from the mechanic or made a gift to the mechanic, it would not go into the numerator of velocity because that transaction would not be part of this tiny economy's gross domestic product (GDP).

Relation to money demand[edit]

The velocity of money provides another perspective on money demand. Given the nominal flow of transactions using money, if the interest rate on alternative financial assets is high, people will not want to hold much money relative to the quantity of their transactions—they try to exchange it fast for goods or other financial assets, and money is said to 'burn a hole in their pocket' and velocity is high. This situation is precisely one of money demand being low. Conversely, with a low opportunity cost velocity is low and money demand is high. Both situations contribute to the time-varying nature of the money demand.^[5] In money market equilibrium, some economic variables (interest rates, income, or the price level) have adjusted to equate money demand and money supply.^{[citation needed]}

The quantitative relation between velocity and money demand is given by Velocity = Nominal Transactions (however defined) divided by Nominal Money Demand.

Indirect measurement[edit]

In practice, attempts to measure the velocity of money are usually indirect. The transactions velocity can be computed as

{displaystyle V_{T}={frac {PT}{M}}}

where

{displaystyle V_{T},}

is the velocity of money for all transactions in a given time frame;

{displaystyle P,}

is the price level;

{displaystyle T,}

is the aggregate real value of transactions in a given time frame; and

{displaystyle M,}

is the total nominal amount of money in circulation on average in the economy (see “Money supply” for details).

Thus ${displaystyle PT}$ is the total nominal amount of transactions per period.

Values of ${displaystyle PT}$ and ${displaystyle M}$ permit calculation of ${displaystyle V_{T}}$ .

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Similarly, the income velocity of money may be written as

{displaystyle V={frac {PQ}{M}}}

where

{displaystyle V,}

is the velocity for transactions counting towards national or domestic product; and

{displaystyle PQ,}

is nominal national or domestic product.

Determination[edit]

The determinants and consequent stability of the velocity of money are a subject of controversy across and within schools of e