Deutsche Bank called it “the summer AI turned ugly.” For weeks, with every new bit of evidence that corporations were failing at AI adoption, fears of an AI bubble have intensified, fueled by the realization of just how topheavy the S&P 500 has grown, along with warnings from top industry leaders. An August study from MIT found that 95% of AI pilot programs fail to deliver a return on investment, despite over $40 billion being poured into the space. Just prior to MIT’s report, OpenAI CEO Sam Altman rang AI bubble alarm bells, expressing concern over the overvaluation of some AI startups and the intensity of investor enthusiasm. These trends have even caught the attention of Fed Chair Jerome Powell, who noted that the U.S. was witnessing “unusually large amounts of economic activity” in building out AI capabilities.
Mark Zuckerberg has some similar thoughts.
The Meta CEO acknowledged that the rapid development of and surging investments in AI stands to form a bubble, potentially outpacing practical productivity and returns and risking a market crash. But Zuckerberg insists that the risk of over-investment is preferable to the alternative: being late to what he sees as an era-defining technological transformation.
“There are compelling arguments for why AI could be an outlier,” Zuckerberg hedged in an appearance on the Access podcast. “And if the models keep on growing in capability year-over-year and demand keeps growing, then maybe there is no collapse.”
Then Zuckerberg joined the Altman camp, saying that all capital expenditure bubbles like the buildout of AI infrastructure, seen largely in the form of data centers, tend to end in similar ways. “But I do think there’s definitely a possibility, at least empirically, based on past large infrastructure buildouts and how they led to bubbles, that something like that would happen here,” Zuckerberg said.
Zuckerberg pointed to past bubbles, namely railroads and the dot-com bubble, as key examples of infrastructure buildouts leading to a stock-market collapse. In these instances, he claimed that bubbles occurred due to businesses taking on too much debt, macroeconomic factors, or product demand waning, leading to companies going under and leaving behind valuable assets.
The Meta CEO’s comments echoed Altman’s, who has similarly cautioned that the AI boom is showing many signs of a bubble.
“When bubbles happen, smart people get overexcited about a kernel of truth,” Altman told The Verge, adding that AI is that kernel: transformative and real, but often surrounded by irrational exuberance. Altman has also warned that “the frenzy of cash chasing anything labeled ‘AI’” can lead to inflated valuations and risk for many.

