Do Extended Unemployment Benefits Lengthen Unemployment Spells?
研究了2007-2009年经济衰退期间美国失业保险福利延长至99周对失业退出的影响，发现延长福利小幅但显著增加了劳动力依附，对找工作影响很小，但能解释长期失业增加的大部分。
In response to the recession of 2007–2009, the maximum duration of U.S. unemployment insurance (UI) benefits was extended to an unprecedented 99 weeks. We exploit variation in the timing and size of the UI benefit extensions across states to estimate their overall impact on unemployment exits, comparing the most recent and prior extension episodes. We find a small but statistically significant increase in labor force attachment due to extended UI in both periods with little or no impact on job finding. Despite these small estimates, extended benefits can account for a substantial share of the increase in long-term unemployment.