The manufacturer of Oreo cookies recently announced plans to move production of Oreos from Chicago to Mexico, resulting in a loss of 600 U.S. jobs.This should be a wake-up call to defenders of the U.S. sugar program and other job-destroying trade barriers.The leading ingredient in Oreos is sugar, and U.S. trade barriers currently require Americans to pay twice the average world prices for sugar.Sugar-using industries now have a big incentive to relocate from the United States to countries where access to their primary ingredient is not restricted.If the government wants people making Oreo cookies and similar products to keep their...