President Trump has announced that on April 2 he will impose tariffs on countries engaged in “non-reciprocal” trade with the United States—but there are no details on how they will be calculated and who will be targeted, write Matthew P. Goodman and Allison J. Smith.

How Countries Stack Up on Trump's Reciprocal Tariffs
President Donald Trump has announced that on April 2 he will impose tariffs on countries engaged in “non-reciprocal” trade with the United States, but the formula for calculating reciprocal tariff ra…