The chapters in this volume are based on lectures presented at the thirty-sixth Annual Public Lecture-Seminar Series in the 1999–2000 academic year. The series was conducted by the Department of Economics at Western Michigan University and was made possible through generous financial support from the W.E. Upjohn Institute for Employment Research and the College of Arts and Sciences of Western Michigan University. I wish to express my gratitude to my colleagues in the Department of Economics for their support and encouragement, especially the members of the Lecture-Seminar Series Committee, Professors Donald Alexander and Bassam Harik of the Department of Economics, and Dr. Allan Hunt of the W.E. Upjohn Institute for Employment Research.