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In demography, demographic transition is a phenomenon and theory in the social sciences referring to the historical shift from high birth rates and high death rates to low birth rates and low death rates as societies attain more technology, education (especially of women), and economic development. [1]
In the demographic transition model, the size and shape of population pyramids vary. In stage one of the demographic transition model, the pyramids have the most defined shape. They have the ideal big base and a skinny top. In stage two, the pyramid looks similar but starts to widen in the middle age groups.
Population momentum is a consequence of the demographic transition. Population momentum explains why a population will continue to grow even if the fertility rate declines or continues to decline even if the fertility rate grows. Population momentum occurs because it is not only the number of children per woman that determine population growth ...
Zelinsky's Theory of First Effective Settlement was that the dominant culture of a nation is defined by the first settlers who came to an area who are able to effect a self-perpetuating society. The theory states that these first settlers have significant impact on the social and cultural geography of the area, however few these first settlers ...
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Evolutionary biology also suggests the demographic transition may reverse itself and global population may continue to grow in the long term. [37] In addition, recent evidence suggests birth rates may be rising in the 21st century in the developed world. [ 38 ]
Demographic transition theory postulates that as a country undergoes economic development and social change its population growth declines, with birth rates serving as an indicator. At the 1974 World Population Conference in Bucharest, Romania, women's issues gained considerable attention. Family programs were discussed, and 137 countries ...
An example of this is the "Evolutionary Demography Society", formed in 2012/2013 to increase opportunities for inter and multidisciplinary approaches to understanding how life history and ageing are related and lead to different population demographics.