Do good workers hurt bad workers—or is it the other way around?*
通过定向搜索模型研究工人异质性对工资和失业的影响，发现高技能工人工资溢价过高、高技能岗位不足，反而降低了高技能工人的福利，与劳动力市场分割文献的结论相反。
I study the effect of worker heterogeneities on wages and unemployment in a directed search model. A worker's productivity in a given firm depends both on his type and on a worker–firm specific component. Firms advertise unconditional wage offers only. The resulting equilibrium is inefficient, with a too high wage premium for high‐type workers, and too few high‐type jobs. This reduces the welfare of high‐type workers. My findings contrast with the findings in the literature on labor market segmentation, where it is argued that the existence of high‐type workers forces down wages and reduces welfare for low‐type workers.