'in the simple quantity theory of money, the price level is assumed to be constant.
This statement is true.
In the money economy, the quantity theory of money is one of the directions of Western economic thought that emerged in the 16th and 17th centuries. The century has arrived. QTM states that the general price level of goods and services is directly proportional to the amount of money in circulation, or the money supply.
The Quantity Theory of Money is a framework for understanding price changes associated with the money supply in an economy. He argues that an increase in the money supply causes inflation and vice versa. The Irving Fisher model is most commonly used to apply theory.
In Friedman's modern quantity theory of money, money supply is independent of money demand. Monetary authority actions change the money supply, but money demand remains more or less stable.
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