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In demography, demographic transition is a phenomenon and theory which refers 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 demographic transition has occurred in most of the world ...
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 ...
Doctoral advisor. W. Lloyd Warner. Kingsley Davis (August 20, 1908 – February 27, 1997) was an internationally recognized American sociologist and demographer. He was identified by the American Philosophical Society as one of the most outstanding social scientists of the twentieth century, and was a Hoover Institution senior research fellow.
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. . Population momentum occurs because it is not only the number of children per woman that determine population growth, but also the number of women in reproductive
The shockwave from the Chelyabinsk meteor that rocketed across the Russian morning sky on 15 February 2013. In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through ...
As of 2015, there were some two and a half million people born every week around the globe; Generation Alpha is expected to reach close to two billion by 2025. [1] For comparison, the United Nations estimated that the human population was about 7.8 billion in 2020, up from 2.5 billion in 1950. Roughly three-quarters of all people reside in ...
Unified growth theory. Unified growth theory was developed in light of the alleged failure of endogenous growth theory to capture key empirical regularities in the growth processes and their contribution to the momentous rise in inequality across nations in the past two centuries. [1][2][3][4] Unified growth theory suggests that during most of ...
Dependency ratio. The dependency ratio is an age-population ratio of those typically not in the labor force (the dependent part ages 0 to 14 and 65+) and those typically in the labor force (the productive part ages 15 to 64). It is used to measure the pressure on the productive population. Consideration of the dependency ratio is essential for ...