Warren Buffett Warned Investors About This Number 27 Years Ago. It's Never Been Higher. Should AI Investors Worry?

Corporate profits have reached 13% of U.S. GDP in Q2 2026, more than double the 6% level Warren Buffett warned about in 1999. Tech companies, particularly Amazon, Alphabet, Microsoft, and Meta, are driving this surge through massive AI infrastructure spending. However, economists warn that if AI spending slows, these 'paper earnings' could disappear, and rising labor costs may compress margins. Berkshire Hathaway's record stock buybacks suggest caution about current valuations.