1. Professor, College of Economics and Management, Southwest University, No. 2 Tiansheng Road Beibei District, Chongqing, 400715, China P.R.
2. PhD Candidate, Research Institute of Economics and Management, Southwestern University of Finance and Economics, 555 Liutai Dadao, Wenjiang, Chengdu, 611130, China P.R.
3. Master, College of Economics and Management, Southwest University, No. 2 Tiansheng Road Beibei District, Chongqing, 400715, China P.R.
4. Professor, Department of Agricultural Economics and Rural Development, University of Göttingen, Papendiek 16, Göttingen, 37073, Germany.