[1] Minzu Univ China, Sch Econ, Beijing 100081, Peoples R China
[2] Minzu Univ China, China Inst Vitalizing Border Areas & Enriching Peo, Beijing 100081, Peoples R China
[3] Postdoctoral Res Ctr, Ind & Commercial Bank China, Beijing 100032, Peoples R China
[4] China Secur Co Ltd, Res Dept, Beijing 100010, Peoples R China
[5] Guangzhou Univ, Sch Publ Adm, Guangzhou 510006, Guangdong, Peoples R China
[6] Worcester Polytech Inst, Business Sch, Worcester, MA 01609 USA