1. Department of Economics, California State University, Stanislaus, 1 University Circle, Turlock, CA, USA
2. Department of Agricultural Economics, Kansas State University, Manhattan, KS, USA
3. Market and Trade Economics Division, Economic Research Service, USDA (United States Department of Agriculture)
4. Department of Agricultural Economics, Kansas State University, Manhattan, KS 66506, USA
5. Department of Agribusiness, Applied Economics and Agriscience Education, North Carolina A&T State University, Greensboro, NC, USA