As Sir Isaac Newton discovered, the core scientific law of gravity is that what goes up must come down. The principle applies in many areas, which is why markets are jittery about the near-unchecked, three-year growth of stock prices fueled by the strength of the generative-AI revolution.

The market is on a tear, with a large gap growing even wider between public market valuations and the significantly higher private-market valuations of AI-exposed companies. The top five tech companies in the U.S. are, collectively, valued at more than the combined size of the Euro Stoxx 50, the U.K., India, Japan, and Canada—and account for around 16% of the entire global public equity market, according to Goldman Sachs.

It’s not just AI model makers and the firms that provide their infrastructure: It’

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