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T . nHE number of inhabitants of a particular place changes through time because of additions through births, subtractions through deaths, additions through inmigrations, and subtractions through out-migration. Natural change is an index of a numerical or proportional alteration in the number of inhabitants derived by subtracting deaths from births. Net migration is an index of a numerical or proportional alteration in the number of inhabitants derived by subtracting out-migrants from in-migrants. This paper deals with population changes in England and Wales, during the period 1921 to 1931, from the point of view of the varying contribution of natural change and net migration to population gains and losses.' The data
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John W. Webb (1963) studied this question.
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