Free trade (and free immigration, which is essentially the same) is undoubtedly good on the whole. However, the current anti-trade pandering from Trump / Sande

Free trade (and free immigration, which is essentially the same) is undoubtedly good on the whole. However, the current anti-trade pandering from Trump / Sanders and the like may also be correct. Expanded access to markets may be unequal. For example, if there was an untapped country that had a million unemployed meteorologists - signing a free-trade deal with that country would most likely be terrible for meteorologists in America - although all other Americans would be better off with improved weather forecasts. Replace "meteorologists" with "factory laborer" and you can see why so many of the current anti-trade folks are upset with what they see happening. They aren't barbers or plumbers - they're factory workers. The barbers, plumbers and engineers get cheaper stuff (and are better off), but the factory workers get paid less.