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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]
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).
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.
He also created the Zelinsky Model of Demographic Transition. Background and education. An Illinoisan by birth, but a "northeasterner by choice and conviction", ...
Bongaarts was born in Tegelen, the Netherlands, in 1945. [2] [3] He obtained a degree in electrical engineering from Eindhoven University of Technology in 1968.Bongaarts subsequently moved to the United States where he studied physiology and biomedical engineering at the University of Illinois and obtained his PhD in 1972, with a dissertation titled: "A Cybernetic Model of the Demographic ...
In demography and population dynamics, the rate of natural increase (RNI), also known as natural population change, is defined as the birth rate minus the death rate of a particular population, over a particular time period. [1]
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 ...
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.