Uneven returns on AI investment could be a wakeup call for the red-hot stock market, a top economist says. US equities are roaring, with unrelenting tech bullishness putting the the Nasdaq 100 on track for its best quarter in years. Yet, Torsten Sløk of Apollo Global Management wrote in a post on Tuesday that returns on massive AI spending will likely be confined to the tech sector for the foreseeable future. "This creates a dangerous divergence between aggressive, front-loaded valuations today