Tariff wars, unemployment, and top incomes

Motivated by the 2018-19 global tariff war, we develop a multi-country trade model with occupational choice, heterogeneous firms, and unemployment. The model features a complete tariff pass-through and positive optimal tariffs addressing product and labor-market distortions. The quantitative analysis of the model with four countries/regions shows that raising tariffs unilaterally by a country increases welfare but also raises unemployment and top incomes that country, whereas having the opposite impact on tariff-targeted countries. A global tariff reduces every country's welfare, unemployment, and top-income inequality, whereas moving from a worldwide tariff war to free trade raises every country's welfare, unemployment, top-income inequality.