1. Forest Economics and Policy, Department of Forestry and Natural Resources, Associate Graduate Faculty, Department of AgEcon, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY 40546-0073, USA.
2. Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, WI 53706-1598, USA.
3. Department of Economics, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada.