First Author:   Tade Okediji University of Minnesota tokediji@umn.edu   Room 231 Ruttan Hall, Room 231 Ruttan Hall, University of Minnesota St. Paul, 55108, USA   612-624-8957(Phone) 612-624-8957(Fax) Second Author: Qihui Chen China Agricultural University Chen1006@umn.edu   College of Economics and Management, Room 302, China Agricultural University Beijing, 100083, China   8610-6273-8705(Phone)   Third Author: Tian Guoqiang China Agricultural University tiangq@cau.edu.cn   College of Economics and Management, Room 302, China Agricultural University Beijing, 100083, China   8610-6273-8705(Phone)