Vance thinks that jobs lost because of incompetent central planning don't matter—but that jobs lost to immigrants do.In an interview published this week by The New York Times, Sen. J.D. Vance (R–Ohio) calls for a more muscular federal government to intervene even more aggressively in the economy than it already does, to create what Vance calls "incentives" for American workers. In doing so, Vance inadvertently reveals one of the major flaws in this line of analysis. Vance's opinions about these things carry significant weight, in no small part because he's on the shortlist to be Donald Trump's running mate. With...