"Thanks to automation, we now make 85 percent more goods than we did in 1987, but with only two-thirds the number of workers. This suggests that while Mr. Trump can browbeat manufacturers into staying in America, he can’t force them to hire many people. Instead, companies will most likely invest in lots and lots of robots. And there’s another wrinkle to this story: The robots won’t be made in America. They might be made in China"