1. Kellogg School of Management, Northwestern University, 2001 Sheridan Road, Evanston, IL 60208-2001.
2. Finance Department, The Wharton School, 2300 SH-DH, University of Pennsylvania, Philadelphia, PA 19104-6367.
3. Social, Economic, and Housing Statistics Division, US Census Bureau, Washington, DC 20233-8500.
4. Tax Analysis Division, Congressional Budget Office, Ford House Office Building, Washington, DC 20515.