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If net migration is zero but arrivals are mainly around age 25 and departures are mainly around age 70, what structural effect is possible?

Answer and explanation

Correct answer: Average age may fall and working-age share may rise

Zero net migration describes only the balance between people entering and leaving. It does not mean that the age, sex, skills, or other characteristics of migrants are identical. If mostly young adults enter while mostly elderly people leave, the population can change its age composition even when its total number remains nearly unchanged. The average age may fall, and the proportion of people in the working-age group may rise.

The reasoning is based on replacement by age groups. A 25-year-old entrant usually belongs to the working-age population, whereas a 70-year-old departure removes a person from the elderly group. Thus, the same number entering and leaving can still make the population younger and increase the working-age share. Therefore, option A is correct. The other choices confuse numerical balance with demographic structure.

Related tags

Migration Age StructureZero Net MigrationYoung MigrantsWorking Age PopulationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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