1. Postdoctoral Research Associate in Agricultural and Applied Economics, Texas Tech University, Lubbock, TX 79409‐2132, USA; E‐mail:
2. Professor Economics, Utah State University, Logan, UT 84322‐3530, USA; E‐mail:
3. Professor of Economics, Utah State University, Logan, UT 84322‐2701, USA; E‐mail: