The End of Monopoly: How AI Is Shattering the Illusion of Unbeatable Profits

Jeremy Grantham’s warning about the impending doom of Big Tech’s monopoly profits has sparked a mix of skepticism and fascination. As one of the most respected voices in finance, his predictions are always worth attention. But what’s striking about this latest pronouncement is its timing – and underlying logic.

Grantham claims that AI will usher in an era of brutal competition, draining profit margins and ending the reign of Big Tech monopolies. This might seem counterintuitive at first, given that AI has been hailed as a silver bullet cementing their dominance. However, Grantham’s historical context – and willingness to challenge conventional wisdom – reveals a different story.

The Unprecedented Antitrust Era

The past two decades have seen a peculiar time for antitrust regulation. As the Magnificent 7 – Amazon, Google, Meta, Microsoft, and their peers – rose to dominance, regulators largely stood by, allowing them to consolidate power. This created an environment where profit margins swelled to unprecedented levels. Grantham argues that this era is rapidly coming to a close.

The AI-Driven Arms Race

The current frenzy of investments in AI infrastructure – with the Magnificent 7 earmarking $725 billion this year, roughly 2% of U.S. GDP – is not merely a continuation of their dominance. Rather, it’s an existential arms race, forcing them to compete with each other in ways they never have before. Grantham draws on a historical analogy: the early days of minicomputers, where initial movers enjoyed a genuine edge for only two or three years before adoption became universal and profit margins normalized.

The Misguided Assumption

Markets are pricing the Magnificent 7 at elevated multiples because they assume AI will sustain or expand their historically high profit margins. However, Grantham’s argument cuts against this assumption, suggesting that AI will ultimately leave aggregate corporate profitability unchanged. This challenges one of the most widely held assumptions currently embedded in equity valuations.

The Self-Fulfilling Prophecy

Grantham acknowledges that the current reliance on AI spending has real economic benefits – without it, he believes the U.S. would have slipped into a minor recession in 2023. However, this also highlights the self-fulfilling nature of the bet Wall Street is making: they’re betting on AI to sustain high profit margins, which will ultimately prove false.

Emerging Market Divergence

Interestingly, Grantham points out that GMO’s emerging market fund has returned approximately 70% over the past 12 months compared to roughly 25% for the S&P 500. He frames this as textbook mean reversion from a period in early 2025 when international equities sat near all-time cheapness relative to U.S. stocks.

The Unfolding Reality

While Grantham hasn’t yet sounded the alarm bell – echoing his infamous “Abandon ship” call of July 15, 2008 – he’s certainly watching for signs of blood in the streets. This is a timely reminder that even the most respected voices can be wrong – and that investors would do well to stay vigilant.

In the end, Grantham’s warning serves as a stark reminder that AI is not a panacea for corporate profitability. Rather, it’s a double-edged sword: while it promises transformative benefits, it also risks shattering the illusion of unbeatable profits that has defined Big Tech’s reign. As investors and policymakers grapple with this unfolding reality, one thing is clear: the era of monopoly profits is indeed coming to an end – and AI is the reason why.