# quantity theory of money

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Related to quantity theory of money: Velocity of money

## Quantity Theory of Money

The idea that the amount of money in an economy directly correlates to the price of goods and services. According to this theory, more money in an economy results in higher prices. Nearly all economists agree with the quantity theory of money in the long run, but there is significant disagreement over how true it is in the short term. There is also disagreement over what kinds of money (cash, notes or others) affect prices. The quantity theory of money is a major component of monetarism. See also: Real bills doctrine.

see MONETARISM.

## quantity theory of money

a theory that posits a direct relationship between the MONEY SUPPLY and the general PRICE LEVEL in an economy.

The basic identity underlying the quantity theory was first developed by Irving Fisher (1867–1947) in 1911. The Fisher equation states that:

where M is the money stock, V is the VELOCITY OF CIRCULATION of money (the average number of times each £ or \$ changes hands in financing transactions during a year), P is the general price level, and T is the number of transactions or the total amount of goods and services supplied.

The above relationship is true by definition because total money expenditure on goods and services (MV) in a period must equal the money value of goods and services produced (PT), and the four terms are defined in such a way that the identity must hold. However, the identity can be converted into a testable equation by assuming that the velocity of circulation of money is constant or changes slowly.

Economists at Cambridge University reformulated the traditional quantity theory of money to emphasize the relationship between the stock of money in an economy (M) and final income (Y), of the form MV = Y. The income velocity of circulation (Cambridge equation) is thus:

where V is the average number of times the money stock of an economy changes hands in the purchase of final goods and services. For example, taking Y as gross national product, if a country has a GNP of £5,000 million and an average money stock (M) over a year of £1,000 million, then V is 5. Velocity cannot be observed directly and is thus determined using Y and M, figures that may be calculated from government statistics.

The term V in the Cambridge equation is not the same as V in Fisher's traditional quantity theory of money In Fisher's equation, MV = PT, rearranged to give:

the number of transactions in the period, T, includes all transactions for real goods and services plus financial transactions. In the Cambridge equation, PT (where P = average price level) is replaced by Y, which contains not all transactions but only those generating final income. This formulation allowed the Cambridge economists to emphasize real income (that is, final goods and services).

The classical economists argue that velocity of circulation was constant because consumers have relatively constant spending habits and so turn over money at a steady rate. This argument converts the identity into an equation that leads to the quantity theory that expresses a relationship between the supply of money and the general price level. If V and T are constant, then:

The modern exponents of the quantity theory (see MONETARISM) do not necessarily hold that the velocity of circulation is fixed, but they argue that it will change only slowly over time as a result of financial innovations, like the spread of bank accounts and cheque payments and the growing use of credit cards. They also point out that in a fully employed economy there is a maximum amount of goods and services being produced and which therefore can be exchanged, so the number of transactions, T, is determined by real supply-wide considerations, like productivity trends. With V and T fixed or slowly changing, then the price level is determined by the stock of money, M. Any increase in the money supply feeds directly into an increase in demand for goods and services (AGGREGATE DEMAND). It follows that if the money supply (M), and hence aggregate demand, increase over time faster than the supply capacity of the economy (T), the result will be a rise in the general price level, P (INFLATION). By contrast, Keynesian economists argue that the velocity of circulation is unstable and changes rapidly and may offset changes in the money stock. See alsoTRANSMISSION MECHANISM, MONEY SUPPLY/SPENDING LINKAGES, MONETARY POLICY.

References in periodicals archive ?
The view that inflation is a monetary phenomenon is based on the traditional Quantity Theory of Money (QTM):
Thus, for an economy with agents that are heterogeneous in age, endowments of wealth and station, and preferences for employment and work effort, we have derived an aggregate demand function that is similar to the quantity theory of money equation.
This paper describes a classroom simulation technique designed to teach the quantity theory of money and related concepts.
Some international evidence on the quantity theory of money.
In his first line of attack [1936, Books II, III, and IV], Keynes took the institutional variables of the orthodox model as given and examined the functional relationships contained in the orthodoxy's concept of equilibrium, the loanable funds theory of interest rate determination, and the quantity theory of money.
The first was Keynes's rejection of the quantity theory of money, a theory he inherited from his English predecessors and that he himself had embraced and to which he contributed earlier in his professional career.
Instead, Chicago's monetarists pressed ahead with refinements of the quantity theory of money.
This money demand explanation is consistent with the quantity theory of money if we recognize that velocity is affected by the interest rate.
The profession, having abandoned or denatured Keynes, purged itself of all radical impulses and soon moved sharply to the right, reviving two time-honored fallacies: Say's law of markets and the quantity theory of money, now respectively rechristened supply-side economics and monetarism.
Of the republished chapters, that on Jean Bodin concludes that 'Bodin did indeed formulate a recognisable version of the quantity theory of money in his Response to Malestroit (p.
He used the quantity theory of money, and refurbished and extended it .
A notable collection of empirical studies edited by Friedman, Studies in the Quantity Theory of Money (1956b), was based on doctoral dissertations supervised in his famous Money and Banking Workshop at Chicago.

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