Transaction Costs and the Take‐Up of Social Safety Net Programs: Evidence From the Combined Application Project
研究联合申请项目（CAP）如何通过降低交易成本提高老年人补充营养援助计划（SNAP）的参与率，发现参与率提升8-13个百分点，自动注册效果最佳。
ABSTRACT This paper studies the effect of transaction costs on the take‐up and targeting of social safety net programs in the context of multi‐program enrollment by exploiting the Combined Application Project (CAP), a widespread state‐level policy designed to encourage enrollment in the Supplemental Nutrition Assistance Program (SNAP) among elderly recipients of Supplemental Security Income. I show that the CAP increased SNAP take‐up by 8–13 percentage points, or about 17%–24%. The increase was suggestively larger among those with a higher probability of being food insecure. Exploiting heterogeneity in the format of the CAP across states, I find that “auto‐enrollment” most effectively increased SNAP take‐up.