DONALD TRUMP’S tariff announcement on April 2nd has drawn mockery for its spurious maths. Any bilateral trade deficit is treated as gross unfairness; the tariffs are set by taking the measure as a share of goods imported from each country, and halving it. But there are other oddities too, from the fact that the tariff rates appear to be calculated for places with an internet domain name to the fact that they are based on a single year of data. The starkest demonstration of the absurdity of the tariffs is to look at the bizarre outcomes they produce. Here is our list of the five craziest duties.