Construct · 1 fields · 1 citations

demographic momentum: a standalone construct

One name. One construct. A landmark on the map.

● anchor · growth locked in by age structure Nearest construct by meaning·not indexed
demographicmomentum1 CONSTRUCTPopulation momentumKEYFITZ · 1971

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Demography

Growth continues after fertility reaches replacement

Demographic (population) momentum is the tendency of a growing population to keep growing for decades even after fertility falls to the replacement level, because a history of high fertility has left a large share of people in or entering the childbearing ages. That young built-in age structure guarantees many births for a generation regardless of current fertility, so population size keeps rising before it stabilises. Keyfitz's 1971 On the momentum of population growth derived the ultimate ratio by which such a population will still grow, as a function of its age distribution and vital rates. The construct is a property of age structure, explaining why national populations do not stop growing the moment couples settle at two-child fertility.[1]

Unit
The ratio of ultimate to current population size at the moment fertility reaches replacement
Recovery means
Not applicable
Measured by
Computed from the current age distribution relative to the stationary population implied by replacement-level fertility

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Nearby constructs

demographic transition1 fields · 3 citationsanchor · a standalone constructdependency ratio1 fields · 1 citationsanchor · the age-burden measure of a populationcohort-component method1 fields · 1 citationsanchor · the standard engine of population projection

References

  1. Keyfitz, N. (1971). On the momentum of population growth. Demography, 8(1), 71–80. https://doi.org/10.2307/2060339

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