After months of uncertainty, the White House has finally announced tariffs on Mexico, Canada, and China. The uncertainty since the election and especially the lack of clear communication in the past several days have caused apprehension in the stock market, which is likely part of the reason why these measures were announced on a Saturday, when the markets are closed — always a sign of confidence that an economic policy decision is the right one. The stated purpose is to reduce the flow of illegal drugs and immigrants to the U.S. Trump has had success using blunt-force threats in the...