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University of Guelph, Guelph, ON, 519-806-5176, [email protected]

University of Guelph, Guelph, ON, 613-572-1359, [email protected]

University of Guelph, Guelph, ON, 519-824-4120 x 52765, [email protected]

1Department of Economics, Iowa State University, 65 Heady Hall, 518 Farm House Lane, Ames, IA 50011, [email protected], 515-294-4299

2Department of Economics, East Carolina University, Brewster A-427, Mailstop 580 Greenville, NC 27858, [email protected], 252-737-4318

3Dyson School of Applied Economics and Management, Cornell University, 461 Warren Hall, 137 Reservoir Ave, Ithaca, NY 14853, [email protected], 607-254-3231

Department of Agricultural and Resource Economics, Colorado State University, Fort Collins;

Department of Agricultural Economics, Purdue University, West Lafayette, Indiana;

Department of Agricultural Economics, Purdue University, West Lafayette, Indiana;

Department of Agricultural Economics, Purdue University, West Lafayette, Indiana;

Division of Agricultural Sciences and Natural Resources, Oklahoma State University, Stillwater;

Department of Agricultural and Resource Economics, Colorado State University; Elmer W. Campbell Emeritus Professor of Economics, Bates College, Maine;

National Park Service, Fort Collins, Colorado;

Department of Economics, Appalachian State University, Boone, North Carolina;