BFS 2002 

Contributed Talk 
Peter DeMarzo, Branko Urosevic
A large shareholder who undertakes costly effort to improve a firm's dividends faces a tradeoff. Selling shares will likely lower the share price (as the market anticipates a reduction in effort), while holding the shares implies a less diversified investment portfolio. Moreover, in a dynamic setting a timeconsistency problem emerges: once some shares are sold, the incentive to sell additional shares may increase since the large shareholder is less exposed to the resultant price declines. We analyze a multiperiod general equilibrium model for the optimal trading strategy of a large shareholder. We consider the case in which the large shareholder can commit to a trading strategy, and the case in which such commitment is impossible. Absent commitment, the problem is similar to durable goods monopoly: the share price today depends on the shares expected to be sold in the future. We show that while the large shareholder's stake ultimately converges to the efficient risksharing allocation, this solution entails inefficient monitoring. Moreover, even with continuous trading, with sufficient moral hazard the large shareholder adjusts his stake gradually over time. While the trading strategy (and therefore the dividend process) is complicated, our results produce a simple formula for the equilibrium share price in this setting: the trading strategy of the large shareholder can be ignored, and today's share price is simply the present value of dividends given constant holdings by the large shareholder, but adjusted by a risk premium that reflects the large shareholder's (rather than investors') risk aversion. We apply our model to provide a rational for both IPO underpricing and the use of lockup provisions. Finally, we generalize our results outside the moral hazard framework.