Retirement Lock and Prescription Drug Insurance: Evidence from Medicare Part D
研究了个人处方药保险市场缺失是否导致人们延迟退休，利用2006年Medicare D部分引入作为自然实验，发现65岁前享有退休健康保险的人在65岁后全职工作比例下降8.4个百分点，其中70%转为兼职。
I examine whether lack of an individual market for prescription drug insurance causes individuals to delay retirement. Exploiting the 2006 introduction of Medicare Part D, which subsidized drug insurance for Americans over age 65, I use a triple-differences design that compares labor outcomes of individuals with retiree health insurance up to age 65 to those with insurance for life, before and after age 65, before and after 2006. I find that those with benefits only to age 65 decreased full-time work by 8.4 percentage points, of which 70 percent was due to transitions to part-time work.