Abstract
One of the most striking portfolio puzzles is the disposition effect: the tendency of individuals to sell stocks in their portfolios that have risen in value since purchase, rather than fallen in value. Perhaps the most prominent explanation for this puzzle is based on prospect theory. Despite its prominence, this hypothesis has received little formal scrutiny. We take up this task, and analyze the trading behavior of investors with prospect theory preferences. Surprisingly, we find that, in its simplest implementation, prospect theory often predicts the opposite of the disposition effect. We provide intuition for this result, and identify the conditions under which the disposition effect holds or fails. We also discuss the implications of our results for other disposition-type effects that have been documented in settings such as the housing market, futures trading, and executive stock options.
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