[1] Xian Univ Architecture & Technol, Sch Publ Adm, Xian 710055, Peoples R China
[2] Minist Commerce, Natl Tariff Commiss, Islamabad 44000, Pakistan
[3] Univ Sains Malaysia, Econ Program, Sch Social Sci, George Town 11800, Malaysia
[4] Istanbul Gelisim Univ, Dept Econ & Finance, TR-34310 Istanbul, Turkey
[5] South Ural State Univ, Dept Financial Technol, Chelyabinsk 454080, Russia
[6] Zhejiang Univ, Sch Econ, Hangzhou 310000, Peoples R China