[1] Fed Coll Educ Tech, Sch Business Educ, Potiskum, Yobe State, Nigeria
[2] Univ Vaasa, Sch Accounting & Finance, Dept Econ, Vaasa 65101, Finland
[3] South Ural State Univ, Dept Econ & Finance, Chelyabinsk, Russia
[4] Cent Bank Nigeria, Res Dept, Abuja, Nigeria
[5] Istanbul Gelisim Univ, Fac Econ Adm & Social Sci, Dept Econ & Finance, Istanbul, Turkey