title: A rejoinder to David Lucas.
abstract: Abstract   In order to clarify the main points at issue, I shall pinpoint some of the major differences between my approach to the study of fertility differentials in Southern Nigeria and that of Lucas.
authors.affiliation: a      Department of Economics   ,  University of Nigeria   ,  Nsukka ,    Nigeria.
authors.forename: A O
authors.initials: AO
authors.lastname: Okore