Despite mounting threats to the US economy — from high tariffs to collapsing immigration, eroding institutions, rising debt and sticky inflation — large companies and investors seem unfazed. They are increasingly confident that artificial intelligence is such a big force, it can counter all the challenges.

Lately, this optimism has become a self-fulfilling prophecy. The hundreds of billions of dollars companies are investing in AI now account for an astonishing 40 per cent share of US GDP growth this year.

AI companies have accounted for 80 per cent of the gains in US stocks so far in 2025. That is helping to fund and drive US growth, as the AI-driven stock market draws in money from all over the world, and feeds a boom in consumer spending by the rich.

Since the wealthiest 10 per cent of the population own 85 per cent of US stocks, they enjoy the largest wealth effect when they go up. Little wonder then that the latest data shows America’s consumer economy rests largely on spending by the wealthy. The top 10 per cent of earners account for half of consumer spending, the highest share on record since the data begins.