Buffett Indicator
Total US stock market value as a percentage of GDP.
The Buffett Indicator is 218.1% GDP as of January 1, 2026 — 2.8 standard deviations above its historical mean of 83.7, a Strongly Overvalued reading.
Historical crashes marked on this chart (6)
The dashed red lines flag major US market crashes within this indicator’s history. Here is what happened at each and what followed.
- Kennedy Slide (1962)
- A rapid spring 1962 sell-off (the 'Flash Crash of 1962') wiped roughly 27% off the S&P 500 amid fears over the economy and a clash with steelmakers. Markets stabilized and recovered within about a year.
- 1973–74 oil crisis bear market (1973)
- The OPEC oil embargo, Watergate, and stagflation drove a roughly 48% decline over nearly two years — the worst bear market since the 1930s. Stocks took years to recover in real terms.
- Black Monday (1987)
- On October 19, 1987 the Dow fell 22.6% in a single day — the worst one-day drop in history — driven partly by program trading. The economy avoided recession and markets recovered within two years.
- Dot-com crash (2000)
- The tech bubble burst in March 2000; the Nasdaq lost about 78% by 2002 as internet valuations collapsed. A mild recession followed and tech stocks took roughly 15 years to reclaim their peak.
- Global Financial Crisis (2008)
- The subprime mortgage meltdown and Lehman Brothers' collapse cut the S&P 500 about 57% into March 2009. It triggered the Great Recession, sweeping bailouts, and a decade of near-zero interest rates.
- COVID crash (2020)
- Pandemic lockdowns caused the fastest bear market ever in February–March 2020, a roughly 34% plunge in weeks. Unprecedented Fed and fiscal stimulus sparked a rapid recovery to new highs.
Overview
The Buffett Indicator — also called the market-cap-to-GDP ratio — is the total value of the US stock market divided by US gross domestic product (GDP). Warren Buffett once called it 'probably the best single measure of where valuations stand at any given moment.' It answers a simple question: is the stock market worth more than the economy that supports it? When market value races far ahead of the underlying economy, it has historically signaled a bubble — the ratio hit about 140% before the 2000 dot-com crash and exceeded 200% in 2021.
How to read it
A reading near 100% means the stock market is valued at roughly one year of US economic output — historically normal. Because the ratio has drifted upward for decades, we judge it against an exponential trend with standard-deviation bands rather than the flat 100% line: the further above trend it sits, the more stretched valuations are.
How it's calculated
- Estimate total US market value. Here we use the Federal Reserve's Z.1 Financial Accounts series for nonfinancial corporate equities, which extends back to 1945.
- Divide by annualized nominal GDP from the Bureau of Economic Analysis.
- Because the ratio grows structurally over time, the verdict is measured against an exponential trend line with standard-deviation bands rather than a flat average.
Criticisms
- Ignores interest rates — low rates push investors into equities and can justify a higher ratio.
- Market value reflects international earnings of US-listed firms, while GDP is domestic-only, biasing the ratio upward as globalization grows.
Frequently asked questions
- What is a good Buffett Indicator level?
- The long-run average is roughly 100% — the US stock market being worth about the same as one year of GDP. Readings well above 100% are considered expensive, and above ~150% historically expensive; below 100% is closer to fair or cheap.
- How high was the Buffett Indicator before past crashes?
- It reached roughly 140–150% at the peak of the dot-com bubble in 2000, then set fresh record highs above 200% in 2021 — the most extreme readings in its history.
- Why is it called the Buffett Indicator?
- Warren Buffett described the ratio of total market value to GDP in a 2001 Fortune article as "probably the best single measure of where valuations stand at any given moment," which is why it carries his name.