A Schumpeterian Model of Protection and Relative Wages
构建了一个基于研发的动态一般均衡模型，分析贸易自由化如何通过影响研发投资和技术变革，降低非熟练工人相对工资并推动技能升级，为美国等北方国家间贸易导致的工资不平等加剧提供了理论解释。
This paper presents a dynamic general equilibrium model of R&D-based trade between two structurally identical countries in which both innovation and skill acquisition rates are endogenously determined. Trade liberalization increases R&D investment and the rate of technological change. It also reduces the relative wage of unskilled workers and results in skill upgrading within each industry when R&D is the skilled-labor intensive activity relative to manufacturing of final products. Time-series evidence from the United States and simulation analysis support the empirical relevance of the model, which offers a North–North trade explanation for increasing wage inequality.