1. Professor, China Academy for Rural Development, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China P.R.
2. Associate Professor, Department of Agricultural Economics, Kansas State University, 304 G Waters Hall, Manhattan, KS 66506, USA.
3. Associate Professor, Department of Agricultural Economics, University of Nebraska-Lincoln,1625 Arbor Dr., Lincoln, NE 68583, USA.