1. Department of Agricultural Economics, College of Economics and Management Nanjing Agricultural University Nanjing China
2. Department of Accounting, Business School Jinling Institute of Technology Nanjing China
3. Department of Economic and Technological Change, Center for Development Research (ZEF) University of Bonn Bonn Germany
4. Department of Agricultural Economics, Academy of Global Food Economics and Policy & College of Economics and Management China Agricultural University Beijing China