Battered by a sense that everything from stocks to gold looks expensive, some long-term investors are retreating from the markets, saying recent price movements are too perilously "irrational". Photo by Richard Drew/AP Photo/Postmedia files

The writer is chair of Rockefeller International. His latest book is ‘What Went Wrong With Capitalism’

Amid mounting fears of an artificial intelligence-led bubble , many investors feel trapped between the optimists who say high valuations for stock prices make sense because AI is the biggest tech revolution ever, and pessimists who say this time is no different and any bubble eventually deflates. The trap feels deeper for lack of options, since gold, bonds and other havens also look pricey.

But there is a once-in-a-generation opportunity in gl

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