[1] Guangdong Univ Foreign Studies, Sch Econ & Trade, Guangzhou 510006, Guangdong, Peoples R China
[2] Erciyes Univ, Fac Econ & Adm Sci, Dept Econ, Kayseri, Turkey
[3] King Saud Univ, Coll Engn, Sustainable Energy Technol SET Ctr, Riyadh, Saudi Arabia
[4] Baoji Univ Arts & Sci, Sch Econ & Management, Baoji, Peoples R China
[5] Guangdong Univ Foreign Studies, Sch Business, Guangzhou 510006, Guangdong, Peoples R China