Assume for a moment that America fully embraces free trade, and it works exactly as planned: we offshore all our low-margin production to developing countries, and this indeed frees-up our population to work in lucrative industries like product design, finance, management etc. While this may make America richer (in the short term), it will not necessarily make Americans richer. Why? Not everyone can be an engineer, investment banker, or lawyer—most people just aren’t smart enough, and many more don’t have the personality for it. It’s harsh, but true. Charles Murray explains in his seminal book The Bell Curve that human...