The authors show that estimated productivities of labor and capital, which rationalize trade flows across countries, are related to total factor productivities, which rationalize output differences across countries. They present evidence that these productivities from trade are related to the...

The first step in understanding international income differences is measuring supplies of various factors of production and their productivity. Recent work suggests that these calculations should treat workers of different skill levels as imperfect substitutes. However, under this approach, it...