1. Postdoctoral Research Associate, School of Forest Resources and Conservation, University of Florida, 352 Newins-Ziegler Hall, Gainesville, P.O. Box 110410, FL 32611, USA.
2. Professor, Department of Agricultural Economics, Purdue University, 403 West State Street, West Lafayette, IN 47907, USA.
3. Professor, Department of Agricultural, Food, and Resource Economics, Michigan State University, 446 W. Circle Dr., Rm 307, Justin S Morrill Hall of Agriculture, East Lansing, MI 48824-1039, USA.