Institution: | Department of Economics and Finance , University of Wyoming, Laramie, WY 82071–3985, U.S.A.; Political Economy Research Center , 502 S. 19th Avenue, Suite 211, Bozeman, MT 59718, U.S.A.; Resources for the Future , 1616 P Street NW, Washington, D.C. 20036, U.S.A.; Ecosystem Sciences Division , 151 Hilgard Hall #3110, University of California, Berkeley, CA 94720–3110, U.S.A.; Department of Economics , 1915 Roma St. N.E., University of New Mexico, Albuquerque, NM 87131, U.S.A.; Department of Economics , University of Washington, Box 353330, Seattle, WA 98195, U.S.A; Harris School of Public Policy Studies , University of Chicago, 1155 East 60th St., Chicago, IL 60637, U.S.A.; Department of Agricultural Economics , University of Arizona, Tucson, AZ 85721, U.S.A.; Massachusetts Institute of Technology , Bldg. E53–402, Cambridge, MA 02139, U.S.A.; Department of Applied Economics , University of Minnesota, St. Paul, MN 55108, U.S.A. |