The term population momentum is seen as the ratio of the size of the any given population when it is seen at that new equilibrium level to that of the size of the first population.
Population momentum is known to be one that is seen if a country's fertility rate is said to declines to or is seen below that of the replacement level
It is one where the population size of continues to grow an this is known to be due to the age structure of the population.
Hence, The term population momentum is seen as the ratio of the size of the any given population when it is seen at that new equilibrium level to that of the size of the first population.
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