Abstract
A mortality-fertility index is used to measure the relative importance of mortality and fertility upon natural increase and, by extension, upon population growth or decline. The US in the period 1940-75 is used as the case study. The index is found to provide in a single figure as useful indicator of a population's ability to sustain itself through reproduction: a ratio of 1 reflects no natural increase; a ratio of more than 1 indicates mortality in excess of fertility and a ratio of less than unity signifies positive reproductive change. At a time of zero population growth this index provides a basis for concise effective thematic maps of vital aspects of population change and is likely to be of greater utility in the future. -R.H.Johnson
Original language | English (US) |
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Pages (from-to) | 21-30 |
Number of pages | 10 |
Journal | Geographical survey |
Volume | 8 |
Issue number | 2 |
State | Published - 1979 |
ASJC Scopus subject areas
- General Environmental Science
- General Earth and Planetary Sciences
- General Medicine