Each worker brings a bundle of skills to the workplace, for example, quantitative and communication skills. Since employers must take this bundle as a package deal, they choose workers with just the right mix of skills. We show that international differences in the distribution of worker skill...

Trade theorists continue to puzzle over their surprisingly small estimates of the impact of trade liberalization o n imports. All explanations of the puzzle treat trade liberalization as a given but the level of trade protection is not exogenous. The theo ry of endogenous protection predicts...

The factor price equalization hypothesis is widely at odds with the large variation in factor prices across countries. similarly, the Heckscher-Ohlin-Vanek theorem constitutes an incomplete description of trade in factor services: its predictions are always rejected empirically. These two issues...