Senior Fellows/Fellows

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Senior Fellows/Fellows

Social Contagion and the Survival of Diverse Investment Styles

David HIRSHLEIFER, Andrew W. LO, Ruixun ZHANG
We examine the contagion of investment ideas in a multiperiod setting in which investors are more likely to transmit their ideas to other investors after experiencing higher payoffs in one of two investment styles with different return distributions. We show that heterogeneous investment styles are able to coexist in the long run, implying a greater diversity than traditional theory predicts. We characterize the survival and popularity of styles in relation to the distribution of security returns. In addition, we demonstrate that psychological effects such as conformist preference can lead to oscillations and bubbles in the choice of style. These results offer empirically testable predictions, and provide new insights into the persistence of the wide range of investment strategies used by individual investors, hedge funds, and other professional portfolio managers.
Keywords: Contagion, Investment Styles, Investor Behavior, Investor Psychology, Adaptive Markets
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