Too Much Money Portends High Inflation

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June’s inflation index jumped 5.4% from a year ago, the highest reading since August 2008. The experts were surprised. Clearly, Federal Reserve watchers never bothered to consult

Milton Friedman.

Lost is a core Friedman dictum: “Inflation is always and everywhere a monetary phenomenon.”

In his Feb. 23 testimony to Congress, Fed Chairman

Jerome Powell

said that the growth in the money supply, specifically M2, “doesn’t really have important implications.” The experts, the press and the bond vigilantes were as quick to unlearn monetarism, if they ever had learned it, as Mr. Powell. Reporting about U.S. inflation rarely contains the words “money supply.” We are repeatedly told that the most recent upticks in inflation are anomalous and “transitory.”

Wrong. The inflation upticks aren’t temporary and were predictable, driven by an extraordinary explosion in the money supply. Since March 2020, the M2 has been growing at an average annualized rate of 23.9%—the fastest since World War II. There is so much money out there that banks don’t know what to do with it. Via reverse repurchase agreements, banks and money-market funds are lending money to the Fed to the tune of $860 billion. That’s unprecedented.

According to monetarism, asset-price inflation should have occurred with a lag of one to nine months. Then, with a lag of six to 18 months, economic activity should have started to pick up. Lastly, after a lag of 12 to 24 months, generalized inflation should have set in. That’s the standard monetarist sequence, and it’s been followed to a T.

To get a handle on what the recent money supply explosion implies for inflation, consider a monetarist model for determining national income. That famous model was displayed on Milton Friedman’s California license plates. It’s compact: MV=Py, where M is the money supply, V is the velocity of money (the speed at which it circulates), P is the price level, and y is real gross domestic product.

Plug numbers into the model and solve for M, and money supply (M2) should be growing at around 6% a year for the Fed to hit its inflation target of 2%. With M2 growing at nearly four times the “ideal” rate since March 2020, inflation is baked into the cake, and it’s likely to persist. By the end of the year, the year-over-year inflation rate will be at least 6% and possibly as high as 9%.

Some who like to throw cold water on monetarism argue that the velocity of money has collapsed and will mitigate the inflationary impact of the rapid growth of the money supply. While velocity did collapse with the onset of Covid, it’s on track to pick up until the end of 2024. Consequently, velocity will grease the monetary wheels. That’s why inflation might hit the high end of our forecast range.

Mr. Powell and his colleagues should start paying attention to the money supply. Money matters. Indeed, it dominates.

Mr. Greenwood is chief economist at Invesco in London. Mr. Hanke is a professor of applied economics at Johns Hopkins University.

Wonder Land: Behold the Democrats and GOP locked in a deadly tango over Biden’s $4 trillion. Images: De Agostini via Getty Images

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Appeared in the July 21, 2021, print edition.

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