Free-market economists have always favored free trade. That means there are no quotas or tariffs imposed by any country on any product. The theoretical outcome is that all countries benefit by producing goods that are produced most efficiently and then trading for other products with countries that have a comparative advantage. In other words, the U.S. produces wheat extremely efficiently. Columbia produces coffee very efficiently. If the U.S. produces just wheat and Columbia produces just coffee, the total output of the two countries would be greater than the total if each country made each product and did not trade. If...