1. Department of Economics, Boston University, 270 Bay State Road, Boston, MA 02215 (e-mail: )
2. Department of Economics, Sam M. Walton College of Business, University of Arkansas, Business Building 402, Fayetteville, AR 72701 (e-mail: )
3. RAND Corporation, 1200 South Hayes Street, Arlington, VA 22202 (e-mail: )
4. Wharton Real Estate, University of Pennsylvania, 3620 Locust Walk, 1464 SHDH, Philadelphia, PA 19104 (e-mail: )