[1] Univ Lagos, Dept Econ, Fac Social Sci, Akoka, Nigeria
[2] Lagos State Univ, Sch Fdn, Badagry, Nigeria
[3] Univ Johannesburg, Dept Elect & Elect Engn Sci, Johannesburg, South Africa
[4] Istanbul Gelisim Univ, Fac Econ Adm & Social Sci, Istanbul, Turkey