First Author:   John Stranlund University of Massachusetts-Amherst stranlund@resecon.umass.edu   Department of Resource Economics, 214 Stockbridge Hall, 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 University of Massachusetts-Amherst wzhang@resecon.umass.edu   Department of Resource Economics, University of Massachusetts-Amherst Amherst, 01003, USA