Affiliation: | Wallace E. Huffman is Charles F. Curtiss Distinguished Professor, Department of Economics, Iowa State University;Matthew Rousu is research economist, RTI International;Jason F. Shogren is Stroock Distinguished Professor of Natural Resource Conservation and Management in the Department of Economics and Finance at the University of Wyoming;and Abebayehu Tegene is senior economist in the Food and Rural Economic Division, Economic Research Service, U.S. Department of Agriculture. |