Transatlantic Trade WarU.S. equity markets rose yesterday on news of Donald Trump’s victory, while shares in Europe fell. The EU is America’s biggest trading partner and Trump promises tariffs. EU officials are strategizing on how to deal with a Trump presidency, with some urging cooperation, and others counseling a strong economic counter-punch. The usual fundamental problem involves differences in the terms of trade. One trading partner employes higher tariff and nontariff barriers than the other trading partner. But trade frictions are not always that simple. Currency valuations can play a role, and in the transatlantic, the U.S. trade deficit with Europe in goods is offset by investment flows. During his last presidency, Trump issu...