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How Population Decline Gets Taken Apart
Population change is accounted for as births minus deaths plus net migration.
Fertility projections combine age-specific fertility with the number and age structure of women.
Mortality projections use age-specific mortality to determine deaths and survival through the population projection.
Migration is separated into inflows and outflows, using migration data or modeled assumptions alongside detailed regional demographic inputs.
A projection is conditional on its assumptions and scenarios, not a direct causal account of one region’s observed decline.
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