Buffett Indicator

History

What the Buffett Indicator is

The Buffett Indicator asks one blunt question: what are American investors paying for the whole US stock market, measured against everything the American economy actually produces in a year? It is total US equity market capitalisation divided by nominal GDP, quoted as a percentage. At 100% the market is priced at one year of national output; at 190% it is priced at nearly two.

Warren Buffett described it in a 2001 Fortune essay as "probably the best single measure of where valuations stand at any given moment" — not because it times anything, but because it is very hard to argue with the denominator. Corporate profits are a slice of GDP. If the market's price grows much faster than the economy underneath it for long enough, either margins have permanently re-rated or the price has run ahead of the business.

How it is built

The numerator is the Wilshire 5000 Total Market Index — the broadest published measure of US equity market value, covering effectively every listed US company. The denominator is nominal (not real) GDP, because the numerator is a nominal price too; deflating one and not the other would drift by the inflation rate.

DeepValues stores a daily snapshot of the ratio rather than recomputing it per request, so the reading moves every trading day instead of jumping at quarterly GDP boundaries. The full history is kept, which is what lets the page say where today sits in the distribution rather than only what today is.

Source: Wilshire 5000 ÷ nominal GDP · series page

How to read it

The "Classic" bands on this page are the ones Buffett's essay implied and that most published versions still use: under 75% significantly undervalued, 75–90% modestly undervalued, 90–115% fair value, 115–135% modestly overvalued, and above 135% significantly overvalued.

Those bands were drawn on a market with a different interest-rate regime and a different sector mix. A "Modern" band set exists in the DeepValues app that shifts each threshold up 25–55 points to reflect the post-2010 low-rate era. Neither set is correct in the abstract — the Classic bands tell you where you are against seventy years of history, the Modern bands against the last fifteen. Reading both is the honest use.

What it does not tell you

The ratio has drifted structurally upward for reasons that are not mispricing. US-listed companies earn a far larger share of revenue abroad than they did in 1970, so the numerator captures profits the denominator never counts. Listed firms are also a rising share of total US business as private companies list and private capital concentrates. Both push the ratio up permanently.

It is also useless as a timing tool. The indicator sat above its "significantly overvalued" band for most of 1997–2000 and again for most of 2020–2026; a rule that sells at the threshold would have missed years of returns. Treat it as a statement about the starting price of a long holding period, not a signal.

The other gauges

• Shiller PE (CAPE)The S&P 500 priced against ten years of inflation-adjusted earnings.
• CBOE VIXWhat the options market is charging for the next thirty days of risk.
• AAII SentimentHow bullish individual investors say they are — the classic contrarian read.
• 10-Year Treasury YieldThe discount rate underneath every valuation on the platform.
• Fed Balance SheetThe liquidity tide — how much of today's price is money rather than business.