Population bar graphs for stages of demographic change from expansion to contraction
The leftmost diagram (representing the age structure of a rapidly-growing population) indicates that the number of individuals decreases rapidly with age. The slow-growth model shows that the proportion of individuals decreases steadily with age. The stable population diagram is rounded on top; the older part of the population is a larger proportion of the population than in the other age diagrams. The rightmost diagram represents a population that may be stable or even declining. The relatively few young people may not be making up for the mortality among the older age groups.
Source
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"OpenStax College, Human Population Growth. October 17, 2013."
http://cnx.org/content/m44875/latest/Figure_45_05_03.png
OpenStax CNX
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