As euphoria over artificial intelligence drives the bull market, investors are asking these questions

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Maybe artificial intelligence really will change the world. Maybe the AI euphoria that has driven the stock market higher will turn out to be fully justified by a gusher of profits in years to come. Maybe. But it’s worth pondering all the things we still don’t know about the force that is driving so much of the current bull market. For starters, there is the question of who is going to develop AI. Investors had assumed that a handful of U.S.-based companies would dominate the field. It now seems that may not be true. DeepSeek, a Chinese upstart, burst onto...