Theoretical Issues in the Design of Population Mobility Models

This paper identifies major theoretical guidelines that emerge from recent migration research, and explores their bearing on model design. A conjunctive framework combining two phases is proposed. The first phase is a retention model based on a theory of differential perception and responsiveness; it portrays the decision to move in relation to a socially structured decision threshold. The second phase is an allocation model that portrays the aggregate process whereby a system of destinations compete with each other for shares of available outmigrants.