A diminishing population whose every cohort more than replaces itself

Robert Schoen*, Stefan Hrafn Jonsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We observe that a dynamic population model can have period fertility that is always below replacement and cohort fertility that is always above replacement. We ask whether such a paradoxical population will get larger or smaller, and show that it must become smaller. Cohort replacement does not imply population replacement, and emphasizing fertility timing and cohort fertility ignores the issue of relative cohort size. The resolution of this apparent paradox reinforces the importance of the level of period fertility in demographic analysis.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalDemographic Research
Publication statusPublished - 15 Oct 2003

Other keywords

  • Cohort
  • Fertility


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