First Author:   John Stranlund Department of Resource Economics, University of Massachusetts-Amherst stranlund@resecon.umass.edu   214 Stockbridge Hall, Department of Resource Economics, University of Massachusetts-Amherst Amherst, 01003, USA   413-545-6328(Phone) 413-545-6328(Fax) http://www.umass.edu/resec/faculty/stranlund/index.html Second Author: Wei Zhang Department of Agricultural and Resource Economics, University of California-Davis weizhang@primal.ucdavis.edu   University of California, Davis, University of California, Davis, One Shields Avenue Davis, 95616, USA