[1] Capital Univ Econ & Business, Sch Finance, Beijing 100070, Peoples R China
[2] Tianjin Univ Finance & Econ, Sch Finance, Tianjin 300222, Peoples R China
[3] Hunan Univ, Coll Finance & Stat, Changsha 410006, Peoples R China
[4] Sun Yat Sen Univ, Lingnan Coll, Guangzhou, Peoples R China