The Buffett Indicator is a simple ratio that Warren Buffett once called "probably the best single measure of where valuations stand at any given moment." It compares the total value of the US stock market to the country's GDP.
The Formula
Buffett Indicator = Total US Stock Market Value / US GDP
When total market cap roughly equals GDP (ratio around 1.0 or 100%), the market is considered fairly valued by this measure. Significantly above or below suggests overvaluation or undervaluation.
Historical Ranges
- Below 75%: Potentially undervalued (rare, usually during severe recessions)
- 75% to 100%: Fair value range
- 100% to 120%: Moderately overvalued
- Above 120%: Significantly overvalued
Before the 2000 dot-com crash, the indicator reached about 140%. Before the 2008 financial crisis, it was around 105%. In recent years, it has consistently been above 150%, reaching over 200% at times.
Why It Has Been Elevated
Several factors have pushed the indicator higher in modern markets:
Low interest rates. Decades of low rates pushed investors into stocks, inflating valuations beyond historical norms.
Globalization. Many US-listed companies earn significant revenue overseas. Their market cap reflects global earnings, but the denominator (US GDP) only measures domestic output.
Technology dominance. Asset-light technology companies have very high market caps relative to the economic activity they create compared to traditional industries.
Stock buybacks. Decades of corporate buybacks have reduced shares outstanding while increasing per-share values.
How to Use It
The Buffett Indicator is best used as a big-picture gauge, not a timing tool. It tells you something about the general level of market valuations but does not tell you when a correction will happen.
A high Buffett Indicator suggests:
- Future long-term returns may be lower than historical averages
- The market has less room for multiple expansion
- A correction, when it comes, could be significant
A low Buffett Indicator suggests:
- Future long-term returns may be higher than average
- The market offers more potential upside
- Buying during these periods has historically been rewarding
Limitations
Not a timing signal. The indicator can stay elevated for years. Being overvalued does not mean a crash is imminent.
Structural changes. The economy and markets have changed since this metric was popularized. Comparing today's reading to the 1980s may not be apples to apples.
One metric. No single indicator tells the complete story. Use it alongside earnings yields, interest rates, and other valuation measures.
The Progressive Trailblazer integrates FRED GDP data alongside market research tools. Educational only. Not financial advice.