[1] Sichuan Univ, Sch Econ, Chengtu, Sichuan, Peoples R China
[2] Zhejiang Financial Coll, Dept Investment & Insurance, Hangzhou, Zhejiang, Peoples R China
[3] Minist Ind Mine & Trade, Dept Int Affairs, Tehran, Iran
[4] Feng Chia Univ, Dept Finance, Taichung 40724, Taiwan