The American economy has split in two. There’s a rip-roaring AI economy. And there’s a lackluster consumer economy.You see it in the economic statistics. Last quarter, spending on artificial intelligence outpaced the growth in consumer spending. Without AI, US economic growth would be meager.You see it in stocks. In the last two years, about 60 percent of the stock market’s growth has come from AI-related companies, such as Microsoft, Nvidia, and Meta. Without the AI boom, stock market returns w...