Harvard Business Review LogoSeptember 11, 2026Jonathan Kitchen/Getty ImagesLots of people are asking whether the massive wave of AI infrastructure spending is a bubble poised to burst. But the more important question may be whether this actually poses a serious threat toThere’s a new parlor game circulating global C-suites: Is there an AI capex bubble—and if so, when will it pop? As the financial press dials up estimates of total investment in data centers—from hundreds of billions to lately several trillion dollars—the fear of compute overcapacity, low or negative returns, and a recession escalates.