1. Dept. of Agricultural Economics and Agribusiness Louisiana State Univ. Agricultural Center 105 Martin D. Woodin Hall Baton Rouge LA 70803 USA
2. Food and Resource Economics Dept. Univ. of Florida 1130‐B McCarty Hall Gainesville FL 32611 USA
3. H. Rouse Caffey Rice Research Station Louisiana State Univ. Agricultural Center 1373 Caffey Rd. Rayne LA 70578 USA
4. Dept. of Food and Resource Economics Univ. of Guelph 50 Stone Rd. East, Guleph Ontario N1G 2W1 Canada