[1] Hunan Univ, Econ Coll, Dept Management, Changsha, Hunan, Peoples R China
[2] Univ Lahore, Forman Christian Coll, Dept Econ, Lahore, Pakistan
[3] Natl Univ Modern Languages, Dept Econ, Islamabad, Pakistan
[4] Taif Univ, Turabah Univ Coll, Dept Math, Taif, Saudi Arabia
[5] Univ Tabuk, Fac Sci, Dept Stat, Tabuk, Saudi Arabia
[6] Zhejiang Shuren Univ, Sch Management, Dept Business Management, Hangzhou 310015, Zhejiang, Peoples R China