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Deflation Basics Series: The Quantity Theory of Money

Economics / Deflation Oct 18, 2017 - 02:29 PM GMT

By: EWI

Economics

Here's our challenge.

In order to be aware of the investment pitfalls and opportunities that deflation can bring, we must first understand the basic elements of why it occurs. So our challenge is to try and make monetary economics, a subject that most people would find duller than watching paint dry on a wall, understandable and, dare I say it, fun! It's a big ask but we like a test, and so here is the first in our Deflation Basics Series -- The Quantity Theory of Money.


The Quantity Theory of Money (QTM for short) is the very essence of the true definition of inflation and deflation. You see, most people think of inflation and deflation as the rise and fall or prices when it is actually all about the rise and fall of the quantity of money.

The QTM has its origins in the 16th century and the writings of the Prussian polymath Nicolaus Copernicus as well as followers of the School of Salamanca such as Martín de Azpilcueta. As European nations looted the Americas for gold and silver, an increase in the price of goods in general was noted as the metals were brought back to the Old World. This observation, via the writings of, among others, John Locke, David Hume, John Stuart Mill and Ludwig von Mises, led to a link between the quantity of money in an economy and the level of the price of goods.

QTM is the cornerstone of monetarist economics which was largely developed by Milton Friedman, gaining popularity during the 1970s. Put simply, the Quantity Theory of Money can be expressed as the "Equation of Exchange":

In plain speak, the amount of money in an economy multiplied by the number of times that money is used, equals the price of stuff bought multiplied by the amount of stuff bought.

Let's take a simple example.

If an economy has $1,000 in total and that money is turned over 3 times during a month, total spending equals $3,000 that month. If the amount of stuff bought was 100 items, then the average price of each item would be $3,000 divided by 100 which equals $30.

We can re-arrange the Equation of Exchange to solve for the price level, P:

Therefore, in our economy:

Now let's assume that, the next month, money supply increases from $1,000 to $2,000, with the velocity of money and the amount of stuff bought staying the same. What would be the effect on the average price level?

The average price level has gone up from $30 to $60. The average price of goods has gone up due to the inflation of the money supply.

The next month, the money supply decreases from $2,000 to $500, with the velocity of money and the amount of stuff bought staying the same. What would be the effect on the average price level now?

The average price level has gone down from $60 to $15. The average price of goods has gone down due to the deflation of the money supply.

This basic example shows the relationship between the level of the money supply in an economy and the average level of prices. The catch comes, of course, with the old economics chestnut, the Latin phrase ceteris paribus (all other things being equal). In the ivory towers of academic economics all other things can remain equal, but in the real world, they don't.

So our assumptions in the example above that the velocity of money remained at 3 and that the amount of stuff bought remained at 100 would have to be challenged. In fact, one of the main criticisms of the QTM is that the velocity of money does not remain constant and changes due to the vagaries of spending impulses. However, if money supply didn't change but the velocity of money went down instead, the effect is the same -- lower prices (assuming the amount of stuff bought remained the same that is!).

Monetarists in the 1980s thought that, by targeting money supply growth, the level of goods and service prices in an economy could be controlled. However, although there is a link between the general level of prices in an economy and the amount of money, it is not rigid, and prices can move up and down for a myriad of reasons.

Nevertheless, the general relationship in the Quantity Theory of Money stands. More money in an economy (inflation) tends to lead to higher prices and less money (deflation) tends to lead to lower prices.

What You Need to Know NOW About Protecting Yourself from Deflation

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Your Bond Fund: It's Riskier Than You Think

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This article was syndicated by Elliott Wave International and was originally published under the headline Deflation Basics Series: The Quantity Theory of Money. EWI is the world's largest market forecasting firm. Its staff of full-time analysts led by Chartered Market Technician Robert Prechter provides 24-hour-a-day market analysis to institutional and private investors around the world.

About the Publisher, Elliott Wave International
Founded in 1979 by Robert R. Prechter Jr., Elliott Wave International (EWI) is the world's largest market forecasting firm. Its staff of full-time analysts provides 24-hour-a-day market analysis to institutional and private investors around the world.


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