Documentation and methodology
Figure is based on analysis of United States International Trade Commission Tariff and Trade data and the Penn World Table (Heston, Summers, and Aten 2011). For each trading partner, their share of total imports was multiplied by their levels of GDP per worker relative to the United States (using data from the Penn World Tables). The resulting products were then summed to get the average productivity level of import trading partners. The same exercise was done for exports.