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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]
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The Pew Research Center observes that 50% of births in the year 2100 will be in Africa. [11] Other organizations project lower levels of population growth in Africa, based particularly on improvement in women's education and successful implementation of family planning. [12] 2. World population prospects, 2022 projection [13]
Davis led and conducted major studies of societies in Europe, South America, Africa and Asia, coined the term "population explosion", and played a major role in the naming and development of the demographic transition model. [1] [6] He was also one of the original scholars in the development of the theory of overurbanization.
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 ...
The Zelinsky Model of Migration Transition, [1] also known as the Migration Transition Model or Zelinsky's Migration Transition Model, claims that the type of migration that occurs within a country depends on its development level and its society type. It connects migration to the stages within the Demographic Transition Model (DTM).
This theory has been criticised for its lack of testability, but it has "captured the imagination of many researchers" and stimulated micro-demographic research in the field. He worked on many areas of demographic theory, including the importance of education and the status of women in determining demographic change, and the study of the AIDS ...