Heterogeneous Technology Diffusion and Ricardian Trade Patterns
研究检验了李嘉图技术差异对国际贸易的重要性，利用美国移民社区的技术扩散作为工具变量，发现出口增长对生产率增长的弹性在1.6到2.4之间。
This study tests the importance of Ricardian technology dierences for international trade. The empirical analysis has three comparative advantages: including emerging and advanced economies, isolating panel variation regarding the link between productivity and exports, and exploiting heterogeneous technology diusion from immigrant communities in the United States for identication. The latter instruments are developed by combining panel variation on the development of new technologies across U.S. cities with historical settlement patterns for migrants from countries. The instrumented elasticity of export growth on the intensive margin with respect to the exporter's productivity growth is between 1.6 and 2.4 depending upon weighting.