ABSTRACT
A decade and a half ago, the distinguished sociological demographer Kingsley Davis concluded a masterful overview of human migrations from prehistoric times to the present with this observation: "Whether migration is controlled by those who send, by those who go, or by those who receive, it mirrors the world as it is at the time." 1 This pithy formulation draws attention to changes over time in the respective contributions to world migratory flows of individuals, who are seeking to maximize benefits by moving; and of countries of origin and of destination, which are seeking to shape population movements in accordance with interests of their own.
