1. Eberly College of Arts and Sciences , 5631 West Virginia University , 201 Woodburn Hall , Morgantown , WV 26506-6286 , USA
2. Department of Economics , 6187 University of Oklahoma , 436 CCD1, 308 Cate Center Drive , Norman , OK 73072 , USA
3. Division of Regional and City Planning , 6187 University of Oklahoma , 830 Van Vleet Oval , Norman , OK 73019 , USA