The difficulty with overpopulation and underpopulation is that very few countries can provide for themselves any more. Almost every country trades meaning they are reliant on on other countries.
If population grows faster than resources then there will be a crisis possibly resulting in famine or war.
Ageing populations can also 'save' money in the forms of children's education and maternity care.
LEARN TWO CASE STUDIES FOR THIS (PRO-NATAL AND ANTI-NATAL POLICIES)
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