Data and Code for: Default Options and Retirement Saving Dynamics

Using data from over 100 U.S. retirement plans and a representative U.K. panel, I document the impact of auto-enrollment on retirement savings at different horizons. I replicate the impact of auto-enrollment on participation and contributions in the short–run (at 12 months), but I show that these gains are attenuated over the medium-run (at 36 months). At this longer horizon, the average savings increases are modest, though auto-enrollment significantly lowers inequality in savings. To assess auto-enrollment’s lifetime impact, I estimate a lifecycle consumption-savings model that can fit the observed patterns with a switching cost of approximately $250, smaller than previous estimates.