Does mandatory retirement saving crowd out voluntary retirement saving?

We use administrative data from a large public university to study employee responses to mandatory retirement saving, which represent a policy alternative to nudges. In response to a substantial increase in mandatory saving, we observe full crowd-out of voluntary saving for a subset of low-contributing low earners and high-contributing high earners, but otherwise little crowd-out for most employees. On average, only 30 percent of the mandatory contributions are offset by lower voluntary contributions. Our results suggest that mandatory retirement saving is likely to increase total retirement saving. [ABSTRACT FROM AUTHOR]