There are a couple of important economic lessons that the American people should learn. I'm going to title one "the seen and unseen" and the other "narrow well-defined large benefits versus widely dispersed small costs." These lessons are applicable to a wide range of government behavior, but let's look at just two examples. Last week, President Donald Trump enacted high tariffs on imports of steel and aluminum. Why in the world would the U.S. steel and aluminum industries press the president to levy heavy tariffs? The answer is simple. Reducing the amounts of steel and aluminum that hit our shores...