Ray Dalio: AI Shows 'Classic Signs' of a Bubble Like 1929 and 2000

Bridgewater founder Ray Dalio is back on the bubble beat. On the Diary of a CEO podcast, he said AI enthusiasm has pushed equity markets into territory that rhymes with the setups before the 1929 and 2000 crashes, though he stopped short of calling a top.

What Dalio actually said

Dalio said the current euphoria around AI has produced ‘classic signs’ that a bubble is forming, and while he acknowledges AI is transformative, he argues some stock prices mirror the speculative excesses that preceded the 1929 and 2000 collapses.

‘We are right now rising close to—not at—the same level in 2000 and the same level in 1929,’ Dalio said, citing his proprietary bubble indicators that measure sentiment, concentration, and valuation. In other words: late innings, not necessarily the last inning.

The valuation backdrop

The cyclically adjusted price-to-earnings (CAPE) ratio, which smooths earnings over 10 years and adjusts for inflation, sits near 41. That reading exceeds the 32.6 level reached just before the 1929 crash and is within shouting distance of the all-time high of 44.2 recorded at the peak of the dot-com era.

Jeremy Grantham’s January 2026 paper with Edward Chancellor found price/book and cyclically adjusted earnings multiples at extremes surpassed only in 1929, 1972, 1999–2000, and 2021 — each followed by a devastating correction.

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What actually pricks a bubble

Dalio highlighted two factors that usually ‘prick’ a bubble: rising interest rates that make debt servicing more expensive, and a surge in stock issuance as companies rush to capitalize on investor enthusiasm.

His warning arrives as SpaceX went public in the largest IPO ever, and Anthropic and OpenAI push toward trillion-dollar valuations — the kind of issuance surge historians treat as a bubble’s clearest warning sign. SpaceX has traded below its IPO price ever since going public at a massive valuation.

He is not saying sell everything

Dalio reckons the market is at about ‘80%’ of the euphoria seen in 1929 and 2000, and says the bubble ‘needs to be pricked,’ meaning the broader market may keep rallying without a negative catalyst. He told investors not to sell ‘just because there’s a bubble,’ since ‘we don’t have the pricking of the bubble yet.’

Grantham, Michael Burry and Torsten Sløk have all voiced AI bubble concerns, and Bank of America’s recent fund manager survey found managers believe an AI bubble is the most pressing tail risk facing the market right now.

Options market and stocks to watch

Watch for reaction across the AI complex if issuance keeps accelerating or rates back up:

• NVDA — the AI trade’s bellwether; watch flow around every guidance print and any commentary on hyperscaler capex.
• MSFT — key OpenAI partner; watch for capex disclosures and any signs of AI revenue not matching spend.
• GOOGL — watch for divergence between AI narrative and search monetization data.
• META — watch for pushback on AI capex burn as issuance and spend accelerate across the group.
• SPY — with CAPE near dot-com peaks, watch broad index positioning and GEX for signs of concentration risk unwinding.

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