Offsetting the Incentives: Risk Shifting, and Benefits of Benchmarking in Money Management
33 Pages Posted: 13 Nov 2008
Date Written: December 2002
Money managers are rewarded for increasing the value of assets under management, and predominately so in the mutual fund industry. This compensation scheme gives the manager an implicit incentive to exploit the well-documented positive fund-flows to relative-performance relationship by manipulating her risk exposure. It also provides her with an explicit incentive to manage the fund in accordance with her own appetite for risk. In a dynamic asset allocation framework, we show that as the year-end approaches, the interplay of these incentives induces the manager to optimally closely mimic the index, relative to which her performance is evaluated, when the fund's year-to-date return is just sufficient to cause a higher expected flow. As she falls behind, she gradually increases her risk exposure (via leverage or short selling), reaching an extremum at a critical level of underperformance. This policy results in economically significant deviations from investor's desired risk exposure, substantially impairing them. To better align investors' and managers' incentives, investors or regulators can impose a benchmarking restriction on the fund manager, prohibiting a shortfall relative to a certain reference portfolio to exceed a pre-specified level. The restriction tempers deviations from the investors' desired risk exposure in the states in which the manager is tempted to deviate the most, and hence is beneficial. The analysis reveals how this risk management restriction should be designed for the highest benefit to the investors. Our findings complement and refine results in the related literature on risk taking incentives of mutual fund managers, and are at odds with previous work arguing against benchmarking.
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