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The original Demographic Transition model has just four stages, but additional stages have been proposed. Both more-fertile and less-fertile futures have been claimed as a Stage Five. Some countries have sub-replacement fertility (that is, below 2.1–2.2 children per woman). Replacement fertility is generally slightly higher than 2 (the level ...
Zelinsky Model. 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 ...
Epidemiological transition. Diagram showing sharp birth rate and death rate decreases between Time 1 and Time 4, the congruent increase in population caused by delayed birth rate decreases, and the subsequent re-leveling of population growth by Time 5. In demography and medical geography, epidemiological transition is a theory which "describes ...
Population pyramid. A population pyramid (age structure diagram) or " age-sex pyramid " is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. [1] Males are usually shown on the left and ...
Wilbur Zelinsky. Wilbur Zelinsky (21 December 1921 [1] – 4 May 2013 [2]) was an American cultural geographer. [3] He was most recently a professor emeritus at Pennsylvania State University. He also created the Zelinsky Model of Demographic Transition.
The Rostovian take-off model (also called "Rostow's Stages of Growth") is one of the major historical models of economic growth. It was developed by W. W. Rostow. The model postulates that economic modernization occurs in five basic stages, of varying length. [1] Traditional society; Preconditions for take-off; Take-off; Drive to maturity
Frank W. Notestein in 1945 provided labels for the types of growth patterns of the demographic transition that was found by Warren Thompson sixteen years earlier. [2] With his modern thinking about population, Notestein introduced a program of research and graduate training at American University, as well as creating leadership in scholarship, the formation of policy, and technical assistance ...
The Strauss–Howe generational theory, devised by William Strauss and Neil Howe, describes a theorized recurring generation cycle in American history and Western history. According to the theory, historical events are associated with recurring generational personas (archetypes). Each generational persona unleashes a new era (called a turning ...