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If a country's total growth rate is declining but the 25 to 54 age group will continue growing for another 12 years, which explanation is most appropriate?

Answer and explanation

Correct answer: Large cohorts born earlier are still entering this age group

A population’s total growth rate describes the current balance of births, deaths, and migration. It does not immediately determine the size of every age group, because age groups are formed from people born in earlier years. The 25–54 group over the next 12 years may therefore include large cohorts born during an earlier period of higher fertility, even if present growth has begun to decline.

Option A is correct because these larger earlier cohorts gradually move into the specified adult ages. Age structure has momentum: past birth patterns continue to influence the population for decades. Option B is too absolute, since a falling total growth rate does not make every age group fall at once. C is incorrect because adult cohorts are strongly linked to past births, and D is unsupported because migration need not be zero. Hence A best explains the situation.

Related tags

Cohort EffectWorking Age PopulationDeclining GrowthDemographic LagPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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