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If a city has zero net migration but arrivals are mainly aged 20 to 29 while departures are mainly over 60, what effect is likely?

Answer and explanation

Correct answer: The working-age share may increase

Zero net migration means that the total number of people entering the city equals the total number leaving it. However, equal numbers do not imply equal age groups. If arrivals are mainly young adults aged 20 to 29 and departures are mainly people above 60, the age composition changes even though the total population effect of migration is zero. The working-age share may therefore increase, so option A is correct.

The statement says “may increase” because the final result also depends on the city’s existing age structure and the exact numbers involved. It does not prove that the total population will double, nor that the elderly share must increase. Thus numerical balance in migration can coexist with a significant structural effect. Age-selective migration changes the composition, not necessarily the total size.

Related tags

Migration Age StructureZero Net MigrationWorking Age PopulationPopulation CompositionPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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