Conservatives always make this same fundamental error about immigration and employment and it drives economists crazy

UK Home Secretary Theresa May has done us all a huge favour with her speech on immigration at the Conservative Party conference today, because it gives Britain the opportunity to learn how immigration actually affects jobs, taxes, and the economy. It also gives us the opportunity to learn that May doesn't know much about economics. She got key bits of evidence from the OECD and her own Ministry flat wrong. Even The Telegraph, normally sympathetic to Conservatives, gave her a bad review: "awful...