Age Group Growth Rates and Population Momentum

Abstract

Samuel Preston has asserted in Population Studies that the average of the period age-group growth rates of a population averaged up to the mean generation length is a close approximation to the intrinsic rate of natural increase. This note shows that this claim is not true in general and considers what conditions make it true in special cases. These arguments lead to a reconsideration of population momentum, in particular to a study of the existence of a growth-free initial segment of the age pyramid of a population in transition to stationarity.

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