1. National Research Center for Resettlement, Hohai University, Nanjing 211100, China
2. Institute of Social Development, Hohai University, Nanjing 211100, China
3. Asian Research Center, Hohai University, Nanjing 211100, China
4. Department of Economics and Manageent, Jiangsu Provincial Committee Communist Party College, Nanjing 210009, China