This paper reexamines how risk return relationships are affected by investor uncertainty about the exact parameters of the joint rate of return distribution. We attempt to clarify results relating to three central issues. First, we address the issue of diversification, focusing on an APT, factor...

This paper presents evidence on how the Williams Act affected the corporate acquisitions market. The acquisition process is modeled and three hypotheses about the Act's effects are discussed. These hypotheses imply differing restrictions on how the Act changes the model's parameters. Parameter...

In October 2000, the Securities and Exchange Commission (SEC) passed Regulation Fair Disclosure (FD) in an effort to reduce selective disclosure of material information by firms to analysts and other investment professionals. We find that the information asymmetry reflected in trading costs at...