Biggest bubble in US history
Jeremy Grantham says the current AI-driven market is the biggest investment bubble in American history, surpassing the dot-com boom and the 1989 Japanese market peak.
Snapshot · The Diary Of A CEO with Steven Bartlett
Billionaire's WARNING: I'm SELLING. The Crash Is Already Here!
Explore episode
Jun 25, 2026
Where this was said
How Jeremy Grantham Built An Investing Empire
At 6:53 · chapter starts 6:38
Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
SpaceX: A Fabulous BS Story at the Top of the Bubble
SpaceX defines its addressable market as a quarter of global GDP and talks about mining asteroids. These are exactly the kinds of extraordinary claims that define market peaks. In 50-100 years, people will tell stories about SpaceX's prospectus the way they tell stories about the South Sea Bubble.
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