Panel A of the figure shows the effect of changes in the quantity of money on the price level. This is important because it shows why Friedman’s modern quantity theory of money lost much of its explanatory power in the 1970s, leading to changes in central bank targeting and monetary theory. Modern QTM refers to Friedman’s reformulation or restatement of the earlier simple or crude QTM (or Friedman’s QTM), first pre­sented by him in his well-known article, “Quantity Theory of Money— A Restatement” (Friedman, 1956), repeated in Friedman (1968 b). The modern quantity theory is in fact very much a development of the Cambridge cash balance formulation of the quantity theory. rise of credit cards); as people use cash less often, less money is needed to transact, money supply falls, and velocity rises. You see, most people think of inflation and deflation as the rise and fall of prices when it is actually all about the rise and fall of the quantity of money.

(A) and (B). Friedman’s Theory: In his reformulation of the quantity theory, Friedman asserts that “the quantity theory is in the first instance a theory of the demand for money. Thereafter, the variance increased to between almost −4 and 4 percent, and the pattern has become much less regular. Where, M – The total money supply; V – The velocity of circulation of money. 5 From Exchange Equation to Quantity Theory From the statement of the classical theory, we have the equation of exchange Fisher assumed that velocity was fairly constant in the short run: Velocity is determined by transaction technology factors (e.g. a) velocity is unchanged b) the interest rate returns to its original level . Fisher’s quantity theory of money is explained with the help of Figure 1. Quantity Theory of Money. rise of credit cards); as people use cash less often, less money is needed to transact, money supply falls, and velocity rises. This is discussed below.
“Inflation is always and everywhere a monetary phenomenon in the sense that it is and can be produced only by a more rapid increase in the quantity of money than in output.

Friedman (1970) The Counter-Revolution in Monetary Theory. One of the oldest surviving economic doctrines is the quantity theory of money, which in its simplest and crudest form states that changes in the general level of commodity prices are determined primarly by changes in the quantity of money in circulation. Just as in that formulation the modern quantity theory is concerned with the determination of the money national income incorporating prices and output. The Quantity Theory of Money (QTM for short) is the very essence of the true definition of inflation and deflation. This inflation theory attempts to assign actual value to money and explain why the price of items rises when the items physically stay the … The quan­tity theory of money had come into disrepute, together with the rest of classical economists as a result of the Great Depression of the 1930s. The quantity theory of money as put forward by classical economists emphasised that increase in the quantity of money would bring about an equal proportionate rise in the price level.

The quantity theory of money (QTM) refers to the proposition that changes in the quantity of money lead to, other factors remaining constant, approximately equal changes in the price level.

Quantity Theory of Money. This theory dates back at least to the mid-16th cen- the quantity theory of money, which in its simplest and crudest form states that changes in the general level of commodity prices are determined primarily by changes in the quantity of money in circulation. He, in his essay “The Quantity Theory of Money—A Restatement” published in 1956′, set down a particular model of quantity theory of money.