Loading the player...

What is the 'Quantity Theory of Money'

The quantity theory of money is a theory that variations in price relate to variations in the money supply. The most common version, sometimes called the "neo-quantity theory" or Fisherian theory, suggests there a mechanical and fixed proportional relationship between changes in the money supply and the general price level. This popular, albeit controversial, formulation of the quantity theory of money is based upon an equation by American economist Irving Fisher.

BREAKING DOWN 'Quantity Theory of Money'

The Fisher equation is calculated as:Quantity Theory Of Money

Where: M represents the money supply.

V represents the velocity of money.

P represents the average price level.

T represents the volume of transactions in the economy.

Generally speaking, the quantity theory of money assumes that increases in the quantity of money tend to create inflation, and vice versa. For example, if the Federal Reserve or European Central Bank (ECB) doubled the supply of money in the economy, the long-run prices in the economy would tend to increase dramatically.

Economists disagree about how quickly and how proportionately prices adjust after a change in the quantity of money. The classical treatment in most economic textbooks is based on the Fisher Equation, but competing theories exist.

The Irving Fisher Model

The Fisher model has many strengths, including simplicity and applicability to mathematical models. However, it uses some spurious assumptions to generate its simplicity, including an insistence on proportional increases in the money supply, variable independence and emphasis on price stability.

Monetarist economics, usually associated with the Chicago school of economics, advocate the Fisher model. From their interpretation, monetarists often support a stable or consistent increase in money supply. While not all economists accept this view, more economists accept the monetarist claim that changes in the money supply cannot affect the real level of economic output in the long run.

Competing Quantity Theories

Keynesians more or less use the same framework as monetarists, with few exceptions. John Maynard Keynes rejected the direct relationship between M and P, as he felt it ignored the role of interest rates. Keynes also argued the process of money circulation is complicated and not direct, so individual prices for specific markets adapt differently to changes in the money supply. Keynes believed inflationary policies could help stimulate aggregate demand and boost short-term output to help an economy achieve full employment.

The most serious challenge to Fisher came from Swedish economist Knut Wicksell, whose theories developed in continental Europe, while Fisher's grew in the United States and Great Britain. Wicksell, along with later writers such as Ludwig von Mises and Joseph Schumpeter, agreed that increases in the quantity of money led to higher prices. However, an artificial stimulation of the money supply through the banking system would distort prices unevenly, particularly in the capital goods sectors. This, in turn, shifts real wealth unevenly and could even cause business cycles.

The dynamic Wicksellian and Keynesian models stand in contrast to the static Fisherian model. Unlike the monetarists, adherents to the later models don't advocate a stable price level in monetary policy.

RELATED TERMS
  1. Monetarist Theory

    The monetarist theory is a concept which contends that changes ...
  2. Monetarism

    Monetarism is a set of views based on the belief that the total ...
  3. Fisher Effect

    The Fisher effect is an economic theory created by Irving Fisher ...
  4. Keynesian Economics

    Keynesian Economics is an economic theory of total spending in ...
  5. Circuitism

    Circuitism is a macroeconomic theory that explains how banks ...
  6. Expectations Theory

    The expectations theory uses long-term interest rates to forecast ...
Related Articles
  1. Insights

    Can Keynesian Economics Reduce Boom-Bust Cycles?

    Learn about this famous British economist's proposed solution to a widespread economic problem.
  2. Investing

    Where Is Ken Fisher Spending His Billions- and Why?

    Fisher's fund has considerably outperformed the average hedge fund for the whole of 2016 and part of 2015.
  3. Trading

    John Maynard Keynes - Giant Of Finance

    Keynes' "General Theory" will forever be remembered for giving governments a central role in economics.
  4. Financial Advisor

    Fisher Investments: Investment Manager Highlight

    Take a close look at Fisher Investments, a giant among money management firms.
  5. Trading

    An introduction to the international fisher effect

    The Fisher models have the ability to illustrate the expected relationship between interest rates, inflation and exchange rates.
  6. Investing

    The Top 5 Positions in Ken Fisher's Portfolio (AMZN, LQD)

    Pay attention to whether Amazon.com, Inc. remains the top holding of Fisher Asset Management despite a 27% share price drop during the first five weeks of 2016.
  7. Investing

    Explaining the Liquidity Preference Theory

    According to the liquidity preference theory, investors demand interest in return for sacrificing their liquidity.
RELATED FAQS
  1. How does money supply affect inflation?

    Learn about two competing economic theories of the role of the money supply and whether money supply causes inflation in ... Read Answer >>
  2. What is the difference between Keynesian and monetarist economics?

    Discover how the debate in macroeconomics between Keynesian economics and monetarist economics, the control of money vs government ... Read Answer >>
  3. What does the Fisher Effect say about nominal interest rates?

    Read about what economists call the Fisher effect, which states that real interest rates are equal to nominal rates minus ... Read Answer >>
  4. What is the relationship between inflation and interest rates?

    As interest rates are lowered, more people are able to borrow more money, causing the economy to grow and inflation to increase. ... Read Answer >>
  5. What's the difference between agency theory and stakeholder theory?

    Agency theory and stakeholder theory are both used to understand and explain various types of relationships and challenges ... Read Answer >>
  6. What is Fisher's separation theorem?

    Named after American economist Irving Fisher, it stipulates that the goal of any firm is to increase its value to the fullest ... Read Answer >>
Trading Center