Abstract
National governments, politicians, policy-makers, and planners have become increasingly concerned with the manner in which human populations have been distributed among the component parts of many nations in the Third World, and especially with the three key processes of mobility, fertility, and mortality. As alterations in birth and death rates tend to have far stronger national than regional components, and as such changes can only affect relative population distribution over a very long period of time – in the absence of catastrophic wars and famines – the regulation or influencing of migration is the most effective way of changing the distribution of people between regions or between rural and urban sectors. Such alterations may be seen as desirable for a variety of reasons, including the need to overcome present (or future) imbalances between the distribution of population and resources, and to assist in the implementation of certain national socio-economic goals.1

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