What would a trade war actually look like?

Donald Trump is threatening steep tariffs on all goods entering the U.S. from Canada, Mexico and China.They'll be in place until the countries stop the flow of migrants and drugs illegally entering the U.S., Trump said. Mexico and China have threatened to respond in kind.Businesses, economists and policymakers are trying to figure out how much of this is threat, how much is bluff and how much is real.Trade wars are notoriously easy to start. But they can be difficult to unwind. And the consequen