AI Stocks Supercharge a Tech Bull Market—and Maybe a Bubble

The sudden frenzy over bots gives investors a powerful—if scary—new story to latch on to.

Illustration: Yoshi Sodeoka for Bloomberg Businessweek

Need reasons to feel pessimistic about stocks? They’re everywhere. Inflation, a hawkish Federal Reserve, endless political strife, nosebleed valuations, a potential recession, wobbly regional banks—those are just for starters. Then there’s the bullish case, which has more or less one plank: a nascent technology that’s famous mainly for inciting fears of mass unemployment and, perhaps, the subjugation of humanity.

Guess which side investors are on.