First Author:   Gamal Atallah University of Ottawa and CIRANO gatallah@uottawa.ca   Department of Economics, University of Ottawa, P.O. Box 450, STN.A Ottawa, K1N6N5, Canada   1-613-562-5800(1695)(Phone) 1-613-562-5800(1695)(Fax) http://aix1.uottawa.ca/~gatallah/