[1] Shaanxi Normal Univ, Minist Educ, Key Lab Modern Teaching Technol, Ctr Expt Econ Educ, Xian 710119, Shaanxi, Peoples R China
[2] Northwest Univ, Sch Econ & Management, Xian 710127, Shaanxi, Peoples R China
[3] Stanford Univ, Freeman Spogli Inst Int Studies, Stanford, CA 94305 USA
[4] Univ Louvain, LICOS Ctr Inst & Econ Performance, B-3000 Louvain, Belgium