Wall Street Meets the AI Reality Check: Eisman Sells, Productivity Data Cools, and 1,000 Scientists Hit Pause

The AI boom's return on investment is hitting a wall. Data, and a growing number of skeptics, suggest the payoff is far from certain.

Evidence For

• Steve Eisman, the "Big Short" investor, sold his entire Alphabet stake and is sitting on cash. His fear: companies won't earn returns on the hundreds of billions poured into AI infrastructure. "I think we have a big correction," he told CNBC, if AI fails to deliver.
• Ernie Tedeschi, chief economist at...