MarketCrash

Buffett Indicator — Market Cap to GDP Ratio

Warren Buffett's favorite valuation metric. When this ratio spikes above 100%, history shows the market is living on borrowed time. Are you prepared?

Buffett Indicator

Market capitalization to GDP ratio. Warren Buffett's preferred valuation metric for the overall stock market.

Thresholds: Negative >150 • Warning ≥120 • Positive <120

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What Is the Buffett Indicator?

The Buffett Indicator divides total US stock market capitalization by gross domestic product (GDP). Warren Buffett described it as "probably the best single measure of where valuations stand at any given moment."

How It's Calculated:

  • Ratio = Total Market Cap / GDP
  • Uses Wilshire 5000 for total market cap
  • GDP data from Bureau of Economic Analysis
  • Historical average around 70-80%

Signal Thresholds:

  • Below 80%: Undervalued — strong buy zone
  • 80-120%: Fairly valued to stretched
  • Above 120%: Significantly overvalued
  • Above 150%: Extreme bubble territory

Historical Track Record

The Buffett Indicator has flagged every major market bubble in modern history. Before the 2000 dot-com crash it hit 146%. Before the 2008 financial crisis it reached 109%. Each time investors who ignored the warning paid dearly.

Dot-Com Peak (2000)

Buffett Indicator hit 146% — the highest reading in history at the time. NASDAQ lost 78% over the next 2.5 years.

Financial Crisis (2007)

Reached 109% before the S&P 500 fell 57%. The ratio didn't return to normal until 2009.

COVID Crash (2020)

Was at 152% before the fastest bear market in history. Massive stimulus drove a rapid recovery.

Limitations to Consider

No single indicator is perfect. The Buffett Indicator has structural biases — US companies earn significant revenue overseas (inflating market cap relative to domestic GDP), and interest rates affect fair valuation levels. Use it alongside other metrics for a complete picture.

The Buffett Indicator is provided for educational purposes only. Not investment advice. Past performance does not guarantee future results.