Over the past two decades, mutual funds have been one of the fastest growing institutions in this country. At the end of 1980, they managed less than 150 billion dollars, but this figure had grown to over 4 trillion dollars by the end of 1997 a number that exceeds aggregate bank deposits (Pozen (1998)). From 1988 to 2000, the percentage of American households owning mutual funds rose from 24 percent to 49 percent (Investment Company Institute (2000)). While the flow of new money has leveled off recently in the face of market declines, the mutual fund industry remains among the most important in the economy. Moreover, actively managed funds control a sizeable stake of corporate equity and play a pivotal role in the determination of stock prices (see, e.g., Grinblatt, Titman and Wermers (1995), Gompers and Metrick (2001)).
The economics literature on mutual funds has largely focused on two issues. The first, which dates back to Jensen (1968), is whether managers are able to beat the market. The consensus is that a typical manager is not able to earn enough returns to justify her fee, i.e. funds under-perform the market by about 1% annually (see, e.g., Malkiel (1995), Gruber (1996)). The second is the agency problem (between individual investors and mutual fund companies) arising out of delegated portfolio management. An important message of this literature is that performance-based incentives (whether explicit or implicit incentives related to fund flows) influence the risk-taking behavior of fund managers (see, e.g., Brown, Harlow and Starks (1996), Chevalier and Ellison (1997, 1999)).