Some of the world’s largest tech companies, like OpenAI, Google and Meta, have invested hundreds of billions of dollars into artificial intelligence as they try to build the data centres they need. And right now, a lot of the stock market’s growth is based on AI companies. But what if it’s all a big financial bubble? And if it is, what are the signs it’s about to pop?

Globe business reporter Joe Castaldo, who covers AI, explains why markets are twitchy about AI right now and what’s behind investors’ concerns.

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