[1] Northwest Univ, Sch Econ & Management, 1 Xuefu Ave, Xian 710127, Peoples R China
[2] Renmin Univ China, Sch Econ, 59 Zhongguancun St, Beijing 100872, Peoples R China
[3] Renmin Univ China, Natl Acad Dev & Strategy, 59 Zhongguancun St, Beijing 100872, Peoples R China