First Author:   Ingela Alger Carleton University ingela_alger@carleton.ca   Department of Economics, Carleton University, 1125 Colonel By Drive Ottawa, K1S 5B6, Canada   1-613-520 2600 ext 1509(Phone) 1-613-520 2600 ext 1509(Fax) www.carleton.ca/~ialger