The U.S. money supply grew from roughly $15.4 trillion in February 2020 to about $21.7 trillion by April 2022 - a 41 percent expansion in 25 months. Here is what M2 measures, why it matters, and where the dollars actually come from.
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M2 is the standard measure of how many dollars exist in the U.S. economy that are usable as money. Between February 2020 and April 2022, M2 expanded by about 41 percent - the largest peacetime monetary expansion in U.S. history. Three forces drove it: Fed asset purchases (QE), the Paycheck Protection Program and other fiscal transfers, and bank credit creation. Inflation followed roughly 18 months later, peaking at 9.1 percent in June 2022.
M2 is reported monthly by the Federal Reserve. Between the COVID shock and the start of quantitative tightening, the line went near-vertical. After 2022 the Fed reversed course and M2 fell modestly for the first time in decades. The current trend [VERIFY current FRED M2SL] has resumed slow growth.
M2 is one of several official measures of the money supply. It is broader than M1 (cash plus checking) but narrower than the total of all financial assets. The Fed defines M2 as physical currency in circulation plus the most spendable bank deposits.
M2 does not include large institutional money market funds, repo balances, Treasuries, or stocks. It is a measure of actual usable money - the closest thing to "the dollars that exist."
From the founding of the Fed in 1913 through 2019, M2 had never grown faster than about 13 percent in any single year. In 2020 it grew about 25 percent. By April 2022 the cumulative expansion since the COVID shock had reached approximately 41 percent. There is no peacetime precedent in U.S. history.
About one in every five dollars in circulation in early 2022 was created in the prior 25 months. The CPI inflation that followed was not a mystery to anyone who had watched the M2 line.
M2 does not expand by itself. It expands when the Fed creates reserves and buys assets, when Congress sends out direct payments funded by Treasury issuance, and when commercial banks make new loans. All three ran simultaneously from March 2020 through 2021.
In June 2022 the Fed began quantitative tightening - allowing maturing bonds to roll off the balance sheet without reinvestment, effectively destroying the reserves it had created. M2 contracted modestly through 2023 for the first time in modern history. The contraction was small in absolute terms but politically and economically significant.
By late 2024 M2 had resumed slow growth and is again above its 2022 peak [VERIFY current FRED]. The 41 percent expansion was not undone. It was paused, then resumed.
Once new dollars exist, they don't typically un-exist. They get repriced into asset values, into wages, and eventually into the cost of everyday goods. The window between expansion and felt inflation is roughly 12 to 24 months.
If the supply of dollars grows faster than the supply of goods and services, the price of goods rises in dollar terms. That is not a theory - it is an accounting identity. The 2020 to 2022 expansion was visible in M2 in real time. The CPI response 18 months later was predictable.
For a long-term saver the question becomes: what fraction of your wealth is held in a unit (the dollar) whose supply can expand by 40 percent in 25 months, and what fraction is held in things whose supply cannot? Bitcoin's supply schedule is fixed at 21 million coins, growing on a decaying issuance curve. See Stock to Flow for the contrast.
Last updated 2026-04-14. Not financial advice. Do your own research.