1. Applied Economics, College of Economics and Management, Nanjing Agricultural University, Nanjing, China
2. China Center for Food Security Studies, Nanjing Agricultural University, Nanjing, China
3. Agricultural Economics, Courant Research Centre “Poverty, Equity and Growth”, University of Göttingen, Göttingen, Germany
4. Development Economics, Courant Research Centre “Poverty, Equity and Growth”, University of Göttingen, Göttingen, Germany