First Author:   Mohammed I Shuaibu Department of Economics University of Ibadan mohammed_shuaibu@yahoo.com   Department of Economics, Faculty of the Social Sciences, University of Ibadan Ibadan, Nigeria   +2348033147465(Phone) +2348033147465(Fax) Second Author: Mutiu A Oyinlola Department of Economics University of Ibadan mutiu_oyinlola@yahoo.com   Faculty of the Social Sciences, Faculty of the Social Sciences, University of Ibadan Ibadan, Nigeria   +2348035783969(Phone)