As economists speculate whether the stock market is in an AI bubble that could soon burst, OpenAI CEO Sam Altman has just admitted to believing we’re in one. “Are we in a phase where investors as a whole are overexcited about AI?” Altman said during a lengthy interview with The Verge and other reporters last night. “If you look at most of the bubbles in history, like the tech bubble, there was a real thing. People got overexcited.”He added that he thinks it’s “insane” that some AI startups with “three people and an idea” are receiving funding at such high valuations. “You should expect OpenAI to spend trillions of dollars on data center construction in the not very distant future,” Altman said.