The Buffett Indicator and Shiller PE are both near all-time highs. Here's what they're actually saying

Two of the most famous market valuation gauges are flashing red at the same time, and I think most coverage of them is either breathless or dismissive. Here's the honest version.

**The Buffett Indicator: ~240%** — total US stock market value divided by GDP. In August it hit 240.2%, the highest ever recorded, surpassing the dot-com peak. The 56-year average is about 89%. Buffett once called it "probably the best single measure of where valuations stand at any given moment," and said approaching 200% means "you are playing with fire." We're at 240%.

**The Shiller CAPE: ~41** — S&P 500 price divided by 10 years of inflation-adjusted earnings. The long-run average is about 17. The all-time high is 44.2, set in December 1999. We're at the second-highest reading in 150+ years of data.

So what return should you expect from here? The honest answer is a range, not a number:

- **From CAPE at ~41:** every historical episode with CAPE above 30 delivered under 4% annualized over the next 10 years. BofA's framework (normalized P/E of 32) maps to roughly **-3% annualized** over the coming decade.
- **From the Buffett Indicator at ~240%:** models regressing market-cap-to-GDP against subsequent 10–12 year returns point to roughly **zero or negative real returns** from these levels.

Those are decade-long headwinds, not timing signals — CAPE looked "expensive" through most of the 2010s while the market kept climbing. But directionally, both gauges agree: the next decade's expected return is somewhere between well-below-average and outright negative in real terms.

A few things the headlines usually skip:

1. **Both have real structural critiques.** US multinationals now earn roughly half their revenue abroad, but GDP is domestic — so the Buffett Indicator has a built-in upward drift versus history. CAPE's 10-year window still includes weaker earnings years, which can make it look more expensive than a forward-looking measure would.

2. **The counter-argument deserves steelmanning.** BofA themselves note today's stronger corporate fundamentals could make historical comparisons too pessimistic. The AI capex cycle is genuinely unprecedented — roughly $19 trillion in market value created on AI optimism.

My take: neither indicator tells you to sell everything. What they tell you is that the market has very little room for disappointment — on earnings, on rates, on the AI payoff actually arriving. That's an argument for valuation discipline and margin of safety, not for market timing.

Where do you land — is this time structurally different, or is the math the math?

Not financial advice.