This paper explores the hypothesis that changes in trading patterns and partners of US industries have contributed to skill deepening through defensive, skill-biased innovation. It draws on Thoenig and Verdier's (2003) assertion that, since skill-intensive technologies are less likely to be...

We use 6-digit bilateral trade data to document the effect of WTO/GATT membership on the extensive and intensive product margins of trade. We construct gravity equations for the two product margins where the specifications of these gravity equations are motivated by the model of Eaton and Kortum...