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Odd Lots · June 18, 2026 · 59m

Jeremy Grantham on How to Tell If a Bubble Is About to Burst

Jeremy Grantham
SpotifyApple PodcastsShow Notes

Jeremy Grantham, co-founder of GMO and veteran bubble-spotter, discusses his memoir on long-term investing in short-term markets. He examines current signs of market frothiness, draws parallels between today's AI enthusiasm and the dot-com bubble, analyzes a watershed moment for Big Tech stocks, and shares what signals he watches to identify when bubbles are about to burst.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Curious

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AI Enthusiasm Mirrors Dot-Com Pattern
Current AI market enthusiasm follows structural patterns similar to the dot-com bubble, where paradigm-shifting technology is used to justify unlimited valuation expansion.
ClaudeChatGPTGemini
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Short-Term Markets Punish Long-Term Thinking
Market structure and incentive systems are fundamentally misaligned with long-term value investing, creating institutional pressure toward short-termism regardless of an investor's thesis.
ClaudeChatGPTGemini

Highlights

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Big Tech Stocks Undergoing Watershed Change
A structural shift is occurring in how Big Tech stocks are valued and perceived in markets, marking a turning point from their previous trajectory.
ClaudeChatGPTGemini
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Observable Signals for Identifying Bubble Peaks
Grantham shares his framework for detecting when bubbles are approaching bursting point, based on observable market metrics and investor behavior patterns.
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Editorial

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The Permabear Label and Being Right Too Early
Grantham reflects on the cost of long-term contrarian investing—being correct about eventual outcomes while suffering significant career risk and psychological pressure during extended bull markets.
ClaudeChatGPTGemini

References

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The Making of a Permabear: The Perils of Long-Term Investing in a Short-Term World — Jeremy Grantham (2026) — Grantham's memoir on his bubble-spotting career and long-term investing philosophy

Misc

✧Grantham has successfully identified multiple major bubbles including dot-com, housing, and current tech cycles
✧His contrarian perspective earned him the 'Permabear' label despite being proven right on major calls
✧GMO has built an institutional reputation on long-term value analysis in a short-term market environment
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