Since the 2008 financial crisis, in which the Reserve Primary Fund "broke the buck," money market funds (MMFs) have been the subject of ongoing policy debate. Many commentators view MMFs as a key contributor to the crisis because widespread redemption demands during the days following the Lehman...

There is mounting evidence that retail investors make predictable, costly investment mistakes, including underinvestment, naive diversification, and payment of excessive fund fees. Over the past thirty-five years, however, participant-directed 401(k) plans have largely replaced professionally...