Globalization, Innovation, and Margins of Sourcing
研究发现降低进口关税会减少企业国内创新，因为企业用更便宜的进口中间品替代自制投入，从而降低边际成本但抑制自主创新，并比较了贸易与创新政策对生产率增长的效果。
Abstract This paper uncovers that input tariff reductions result in less domestic innovation, but standard models of trade ensure a positive correlation between importing and innovation. Hence, the paper develops a dynamic framework with a task-specific laboraugmenting productivity and a non-homothetic import demand system to rationalize this finding. The model implies that input liberalization enables firms to use cheaper intermediate imports as a substitute for self-made inputs, a strategy that decreases marginal production costs but also discourages firms from investing in their own inhouse varieties. Finally, the paper compares the effectiveness of trade and innovation policies in boosting aggregate productivity growth.