1. Graduate Student, Dept. of Agricultural and Applied Economics, Virginia Tech, 208 Hutcheson Hall (0401), Blacksburg, VA 24061 (corresponding author).
2. Professor, Dept. of Agricultural and Applied Economics, Virginia Tech, 312 Hutcheson Hall, Blacksburg, VA 24061.
3. Professor, Dept. of Agricultural and Applied Economics, Virginia Tech, 305 Hutcheson Hall, Blacksburg, VA 24061.
4. Economist II, Division of Budget, Planning and Analysis, North Carolina Dept. of Environment and Natural Resources, 217 Jones St., Raleigh-Durham, NC 27603.