Stable population

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The term stable population refers to a population with an unchanging (but possibly nonzero) rate of growth and an unchanging age composition (i.e., the population pyramid does not change in shape) as a result of age-specific birth rates and age-specific death rates that have remained constant for a sufficiently long time.

A stable population may or may not have zero population growth. We can have stable populations that are growing, and we can also have stable populations that are declining.