This paper evaluates a new variant of the popular target date funds used in employer-based retirement savings plans. We call this new variant a "target retirement plan." Instead of increasing the allocation to bond funds as retirement approaches, a target retirement fund gradually purchases...

When is a mechanism designer justified in only asking for ordinal information about preferences? Simple examples show that, even if the planner's goal (expressed by a social choice correspondence, or SCC) depends only on ordinal information, eliciting cardinal information may help with...