In this interview with The Master Investor Podcast, Jeremy Grantham, the legendary investor who predicted the dotcom bust, the 2008 housing crash, and Japan’s lost decades, sees history repeating itself in today’s AI-driven market frenzy.
“It is the guy selling the shovels at the peak of the gold rush, isn’t it?” he says, drawing a parallel between Nvidia’s $4 trillion valuation and the speculative excesses of past bubbles.
Grantham’s warning is stark: “This is one hell of a gold rush. They have no magical monopoly power in the end.” His decades of studying market manias have taught him that the most transformative technologies—railroads, the internet, now AI—inevitably lead to overinvestment and brutal corrections.
Grantham’s skepticism isn’t new, but his urgency is. “The history of the Mag 7 is divided into two halves,” he explains. “The half up until now where basically they each individually owned an area, and the half going forward where increasingly they fight it out tooth and nail to see who is the biggest and best in AI.”
This competition, he argues, will erode the monopolistic advantages that propelled giants like Apple and Microsoft to dominance. The result? A reckoning for investors who assume today’s winners will stay on top.
His comparison to the dotcom bubble is chilling. “Amazon went down 92% [after 2000]. Have you got that? Check it. 92%,” he says. “It was precisely that people could see dotcom was a brilliant idea that guaranteed everyone would overinvest.”
Today, he sees the same dynamic with AI: euphoria masking unsustainable valuations. “The more serious a new technology is, the more obvious it is that it’s serious, the more guaranteed you are to have a bubble.”
Grantham’s advice for ordinary investors is sobering. “They have no interest at all in the future. They extrapolate today’s conditions forever,” he says, describing the market’s tendency to ignore looming risks until it’s too late.
He doesn’t advocate fleeing stocks entirely—”No,” he says—but insists on caution. “If you’re feeling up for taking risk, I would put a lot of money outside the U.S. in equities. And if you’re feeling very nervous, I would have cash.” His preferred havens are international stocks and inflation-protected bonds, assets less exposed to U.S. froth.
For Grantham, the lesson of history is clear: Every bubble breaks. “They always go back to reasonably priced eventually.” The timing, he admits, is impossible to predict. “You can’t possibly call a bubble or a bust to the right day except once every several lifetimes by sheer luck.”
But the outcome isn’t. “This is the highest-priced market in the history of the stock market in the U.S.” he says. “It’s not a good sign for long-term returns.” His parting advice? “Use your own brains.” In a market drunk on AI dreams, that may be the hardest—and most essential—thing to do.
You can watch the interview here:
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