[1] Wuhan Univ, Econ & Management Sch, Wuhan, Peoples R China
[2] Hubei Univ Econ, Inst Adv Studies Finance & Econ, Wuhan, Peoples R China
[3] Southwestern Univ Finance & Econ, Res Inst Econ & Management, Chengdu, Peoples R China
[4] Tsinghua Univ, PBC Sch Finance, Beijing, Peoples R China