[1] Univ Peshawar, Dept Econ, Peshawar 25120, Khyber Pakhtunk, Pakistan
[2] Univ Swat, Dept Econ & Dev Studies, Mingora 19200, Khyber Pakhtunk, Pakistan
[3] Univ Pitesti, Fac Econ & Law, Bd Republicii 71, Pitesti 110062, Arges, Romania
[4] Univ Lucian Blaga Sibiu, Inst Doctoral & Postdoctoral Studies, Bd Victoriei 10, Sibiu 550024, Romania
[5] Univ Bahrain, Coll Business Adm, Dept Econ & Finance, Sakhir 32038, Bahrain
[6] Henan Agr Univ Zhengzhou, Coll Econ & Management, Zhengzhou 450002, Peoples R China
[7] Univ Petr & Gas Ploiesti, Fac Econ Sci, Dept Cybernet Econ Informat Finance & Accounting, Ploiesti 100680, Romania