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Demography is the study by statistical methods of human populants involving the measurement of their size, growth and diminution, the proportions living within some areas, being born, marrying, having children or dying and the related functions of fertility, nuptially and morality. This book begins by defining a number of concepts which are useful for demographic analysis, including the significant events in life and types of statistical data which are collected, published and used. It then describes the various kinds of change which can occur and the underlying causes - social, economic and political. The central section provides an account of the history of population growth and development, and of the situation on an international and national scale. Resources available for the support of mankind and their relationship with living standards are explored. The politics of population and the prospects for the future are also described.