What Across-the-Board Tariffs Could Mean for the Global Economy

Donald J. Trump, the Republican presidential nominee, has floated the idea of a 10 percent tariff on all U.S. imports, a plan that economists say could badly damage trade.Donald J. Trump, the Republican presidential nominee, has floated the idea of a 10 percent tariff on all U.S. imports, a plan that economists say could badly damage trade.