This study examines the impact of the adoption of automatic enrollment provisions by the state of South Dakota for its supplemental retirement saving plan (SRP). In South Dakota, state and local government employees, including teachers, are covered by a defined benefit pension plan and by Social Security. Prior to the introduction of automatic enrollment, the proportion of newly hired employees who were contributing to the SRP was less than 5% in their first year of employment. After the introduction of automatic enrollment, over 90% of newly hired workers who were auto-enrolled were participating in the plan. Using a difference-in-difference approach we find that automatic enrollment changes differences in the participation rate by age, sex, and income. We also find that prior to the adoption of auto-enrollment, agencies that ultimately chose to implement this policy had higher participation rates compared to those that did not adopt auto-enrollment.

这项研究考察了南达科他州对其补充退休储蓄计划（SRP）采用自动注册规定的影响。在南达科他州，包括教师在内的州和地方政府雇员都已享受既定福利养老金计划和社会保障的保障。在引入自动注册之前，为SRP做出贡献的新雇用员工在第一年的比例不到5％。引入自动注册后，自动注册的新雇用工人中有90％以上参与了该计划。使用差异差异方法，我们发现自动注册会根据年龄，性别和收入来改变参与率的差异。我们还发现，在采用自动注册之前，