[1] Univ Int Business & Econ, Sch Int Trade & Econ, Beijing, Peoples R China
[2] Nankai Univ, Sch Econ, 94 Weijin Rd, Tianjin 300071, Peoples R China
[3] Nankai Univ, Ctr Transnatl Studies, Sch Econ, Tianjin, Peoples R China
[4] Nankai Univ, Inst Int Econ, Sch Econ, Tianjin, Peoples R China