Affiliation: | (1) Department of Economics, Emory University, 306C Rich Memorial Building, Atlanta, GA, 30322, U.S.A.;(2) Department of Economics, University of Texas at Arlington, 701 S. West Street, Box 19479, Arlington, TX, 76019, U.S.A.;(3) Department of Agricultural and Resource Economics, North Carolina State University, P.O. Box 8109, Raleigh, NC, 27695-8109, U.S.A. |