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Immigrants’ ages and the structure of stationary populations with below-replacement fertility
Author(s) -
Carl P. Schmertmann
Publication year - 1992
Publication title -
demography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.099
H-Index - 129
eISSN - 1533-7790
pISSN - 0070-3370
DOI - 10.2307/2061854
Subject(s) - fertility , immigration , population , demographic economics , demography , german , total fertility rate , age structure , economics , geography , research methodology , sociology , family planning , archaeology
A sustained regime of low fertility plus immigration yields an unusual kind of stationary population. The author demonstrates that all stationary populations have a common structure, and that the familiar replacement-level fertility population is the youngest among the many stationary populations corresponding to a particular life table. This finding has important consequences for policy because although fertility increase and immigration are equally effective at halting population decline, immigration is inferior as a means of rejuvenating low-fertility populations. In fact, an immigration-based policy could make a low-fertility population older rather than younger. The paper includes examples using U.S. and West German vital rates.

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