Critics often accuse free trade proponents of carrying water for big business. But maybe unrestricted trade isn't always in the best interest of all business. Manufacturers who use steel (car and appliance makers, for example) oppose tariffs on imported steel. However, steel producers of course support them, as they keep competitive foreign steel off the market. While the car maker might opposed steel tariffs, they might support tariffs on foreign-made cars - to protect their share of the domestic market. And steel manufacturers would likely oppose them, as they make it more difficult to sell U.S. steel overseas. Protectionist policies...