Illustration by Tag Hartman-Simkins / Futurism. Source: Getty Images While tech executives wax poetic about AI ushering in four-day workweeks and liberation from labor, economics guru Robert Reich is cutting through the drivel. In an ominous new essay, the former secretary of labor warns that those shortened weeks will also come with much shorter paychecks — leaving the working class scrambling for crumbs in order to survive. The US economy is growing nicely, Reich notes, while the stock market is doing gangbusters. But as for the stuff that really counts for most Americans? It’s “sh*tty,” the plainspoken wonk asserts. And as AI continues to rankle the job market, Reich says the poor and working class will increasingly bear the brunt. To set up his argument, Reich briefly considers comments from business tycoons like Zoom’s Eric Yuan and JPMorgan Chase’s Jamie Dimon, who argue that four- and even three-day work weeks will become the norm thanks to new automation tools. “All of this is pure rubbish,” Reich writes. “Here’s the truth: The four-day workweek will most …