†Accepted by Raffi Indjejikian. I am deeply indebted to my dissertation chair Joel Demski for his guidance and encouragement. I am grateful to Florin Sabac, Pierre Jinghong Liang, Karl Hackenbrack, David Sappington, and Haijin Lin for their helpful comments. I also thank the editor and three anonymous reviewers for their suggestions. This paper also benefits from the workshop participants at University of Alberta, University of British Columbia, University of Florida, and Carnegie Mellon University.