[1] Pamukkale Univ, Fac Econ & Adm Sci, Dept Int Trade & Finance, Denizli, Turkey
[2] Univ Pretoria, Dept Econ, ZA-0002 Pretoria, South Africa
[3] Texas A&M Univ Commerce, Dept Econ & Finance, Commerce, TX USA
[4] Middle East Tech Univ, Dept Business Adm, TR-06531 Ankara, Turkey
[5] Middle East Tech Univ, Earth Syst Sci, TR-06531 Ankara, Turkey