Do informed shareholders who can influence corporate decisions improve governance? We demonstrate this may not be generally true in a model of takeovers. The model suggests that a shareholder's ability to collect information and trade ex post may cause him, ex ante, to support value-destroying...

How should one regulate a firm when its investment may cause a negative externality? In this paper we present a model on regulating a firm run by a manager and owned by a shareholder. The regulator can impose a penalty on the manager, the shareholder, or both. Our characterization of optimal...