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If total population is stable but the working-age share is declining, what must be happening in at least one other age group?

Answer and explanation

Correct answer: An increase in the child or elderly share

The governing mathematical principle is that all age-group percentages in a population composition must add to 100. If the working-age share decreases while the composition remains a complete distribution, the lost percentage must be transferred to one or both of the other categories: children or older persons. Therefore, at least one of those shares must increase. Option B cannot be correct because every category cannot decline while their percentages still total 100. Option C misunderstands percentages, which are relative shares rather than quantities whose total may fall below 100. Option D contradicts the stated decline. Hence option A is unambiguous.

Related tags

Percentage CompositionWorking-Age DeclineAge GroupsPopulation StructureAge StructurePopulation CompositionGeographyClass 12 Mcq

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