M2 money supply vs inflation.
The historical relationship.
When M2 grows faster than the productive economy, prices follow with a 12-to-18 month lag. The 2020 stimulus expanded M2 by 24.6% in a single year. CPIConsumer Price Index (CPI)The government's measure of how much a typical basket of consumer goods costs over time.Full definition peaked at 8.0% in 2022. The chart below plots both series since 2000 so you can see when money-supply spikes lead inflation spikes and when they do not.
This is an educational visualization, not a calculator. Toggle the lag marker to see the 2020 to 2022 relationship explicitly. Pull live numbers from FRED before referencing the exact figures.
If velocity (V) and real output (Q) are roughly stable, then money supply growth (M) determines price growth (P). Doubling M with stable V and Q roughly doubles prices. The complication: V is not stable. The 2008-2015 QEQuantitative Easing (QE)When a central bank creates new money electronically to buy government bonds and other assets, expanding the money supply. expansion did not produce the inflation many predicted because velocity collapsed simultaneously. The 2020-2022 expansion did, because velocity recovered while M2 was already much larger.
M2 grew 24.6% in 2020, the largest single-year expansion in modern US history. CPI followed 12 to 18 months later, peaking at 8.0% in 2022. M2 growth then turned negative in 2022 to 2023 as the Fed tightened. CPI moderated through 2023 to 2024, consistent with the monetarist lag model verify×DON'T TRUST, VERIFYClaim: US M2 grew approximately 24.6% in 2020 (December over December) and CPI averaged 8.0% higher in 2022 than in 2021.Verify at: FRED M2SL ↗ · FRED CPIAUCSL ↗Computed at build time from the site's FRED data snapshot: M2 December over December, CPI annual average over annual average..
Money supply growth predicts inflation with a lag and with noise. The 2008 to 2015 QE expansion did not produce proportional consumer-price inflation because velocity of M2 collapsed simultaneously. The relationship between M2 and CPI is real but not mechanical. Velocity, productive capacity, and supply shocks all matter. Treat the chart as a strong signal, not a forecast.
Sources and methodology
- M2 series: FRED M2SL. Year-over-year percentage change in seasonally-adjusted M2 stock at year-end.
- CPI series: FRED CPIAUCSL. Annual-average CPI for All Urban Consumers, all items, versus the prior year's annual average (the convention behind the widely cited 8.0% for 2022).
- The Fed redefined M1 in May 2020 (savings deposits added). M2 was less affected by the redefinition; the series remains comparable across the boundary.
- The 12-to-18 month lag is a rough rule from monetarist literature, not an exact mechanism. Friedman wrote of long and variable lags; the actual delay in any given cycle depends on velocity, expectations, and supply conditions.
- Chart data is generated at every build from the site's nightly FRED snapshot (data/macro.json); the page itself makes no runtime API calls. The final "June 2026" point is the trailing 12-month change through the latest month in the snapshot. For live data, go to FRED directly.
- Watching M2 growth gives an early read on inflation 12 to 18 months out, before it shows up in your grocery bill or rent.
- When M2 accelerates significantly above GDPGross Domestic Product (GDP)The total value of all goods and services produced in a country in one year. growth, cash holdings begin losing real value before the official CPI prints catch up. The protection (TIPS, equities, real assets, sound-money assets) needs to be in place ahead of the lag.
- When M2 contracts (as in 2022 to 2023), the lag works the other direction: inflation moderates 12 to 18 months later. Don't anchor portfolio decisions to the inflation print at the time you see it; look at the M2 trend.
Not financial advice. Educational visualization; verify exact figures against FRED.