It’s the latest big idea among tech elites, as those in Silicon Valley struggle to cope with growing public unease over the effects digital technologies have had on jobs and income inequality. Dressed up as “universal basic income,” the idea is to give everyone—in some versions, every adult—a fixed sum every month. It’s not a lot of money, but—so the argument goes—it would help people survive as jobs are increasingly lost to robots, software, and automation.