Discussion
Ageing at the base occurs ............
Answer: C
Ageing at the base occurs when fertility declines and new birth cohorts are smaller than previous ones.
A population can age in two ways. Ageing at the base happens when falling fertility makes each new cohort of births smaller than the last, so the base of the pyramid narrows and the share of children falls while the share of older people rises. Ageing at the apex happens when falling mortality lets more people survive to old age.
A constant child share means no ageing at the base, a fall in child mortality actually enlarges the young groups, and fluctuation between cohorts is irregularity rather than ageing.
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