ENTRY BARRIERS, COMPETITION, AND TECHNOLOGY ADOPTION
构建技术采纳模型，研究进入壁垒对全要素生产率的影响，发现降低进入壁垒可使最贫困国家的全要素生产率提升12%。
I build a model of technology adoption to study the quantitative effect of entry barriers on total factor productivity ( TFP ). In my model, incumbent firms choose technologies that are sufficiently productive to deter entry from a potential competitor. I show that higher entry barriers help to deter entry and lead to the choice of less productive technologies. A novelty of my work is that I use a direct measure of entry barriers. I find that reducing entry barriers from their average level in the poorest 30% of countries to their U.S. level leads to a sizeable increase in aggregate TFP of 12%.