The Economist's @econcallum explains why AI still isn't delivering an economic boom, with only 25% of US businesses using it and a critical labor-market shift still missing: "The Census Bureau does the best survey of AI use in American businesses. It’s like 25% of businesses. If we’d sat here in 2023 and said, ‘In late 2026, how many businesses will be using AI?’ Most people would have said pretty much all of them, and it’s now 25%." "You’re gonna have to see AI creating new types of jobs and…