Roland Pongou1, Barthelemy Kuate Defo2, Zacharie Tsala Dimbuene3. 1. Department of Economics, University of Ottawa, Ottawa, ON KN1 6N5, Canada. 2. Département de Démographie, Université de Montréal, Pavillon Lionel-Groulx, Montréal, QC H3T 1N8, Canada. 3. Statistics Canada, Ottawa, ON K1A OT6, Canada.