Loss of Skill During Unemployment and the Persistence of Employment Shocks
证明，当失业工人失去部分技能时，临时就业冲击的影响可能长期持续。关键机制是失业期延长时，薄市场外部性减少工作岗位供给。模型显示即使生产与匹配技术规模报酬不变，也可能出现不同的持续模式与多重均衡。
This paper shows that when unemployed workers lose some of their skills, the effects of a temporary shock to employment can persist for a long time. The key mechanism is a thin market externality that reduces the supply of jobs when the duration of unemployment increases. The paper develops an overlapping-generations model of search equilibrium and shows that different patterns of persistence and multiple equilibria are possible even with constant returns production and matching technologies.