Method evidence record

Population Momentum

Population momentum is the tendency of a growing population to keep growing for decades even after fertility falls to the replacement level, simply because its age structure is heavily weighted toward young people who have yet to reach childbearing age. Introduced by Nathan Keyfitz in 1971, the momentum factor measures how much larger (or smaller) a population will ultimately become if fertility instantly drops to exact replacement. It explains why ending rapid population growth is not immediate: the built-in youthfulness of a fast-growing population carries growth forward long after birth rates stabilize.

Sources recorded, not reviewed

Source record

Citations copied verbatim from the method’s source record. No claim-level verification is inferred from them.

Population Momentum (Keyfitz)

Taxonomic method record · process-pipeline / demography

Keyfitz, N. (1971). On the momentum of population growth. Demography, 8(1), 71–80. · DOI 10.2307/2060339
Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. · ISBN 9781557864512

Open full method

Curated claims

Claims persisted in the evidence ledger, each with its own assessment.

No curated claims yet

This view does not invent a claim assessment when the ledger has none.

Related methods

Generated from the method graph and shown as machine-suggested relations — no evidence claim is inferred.

Same method familyCohort-Component Projectionmachine-suggested · Relational suggestion, not evidence.Same method familyNet Reproduction Ratemachine-suggested · Relational suggestion, not evidence.Used in the same domainStable Population Theorymachine-suggested · Relational suggestion, not evidence.