The artificial-intelligence bubble has been propping up the stock market and the broader economy for a while now. What happens if it bursts?

That's been the question circling Wall Street recently, as Big Tech companies face both unprecedented political pressures from the White House — and new doubts about all the money that's pouring into AI investments.

This past week, AI darling Nvidia reported blockbuster financial results that beat analysts' expectations. But investors weren't impressed. Shares in the chip company dipped 4% in the two days since that report.

Nvidia is still the world's most valuable company, and it alone makes up about 8% of the S&P 500. It and the other so-called "Magnificent Seven" tech companies are contributing both to real economic growth — by investi

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