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In page Demographics of Spain:

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Many demographers have linked Spain's very low fertility rate to the country's lack of a family support policy. Spain spends the least on family support out of all western European countries—0.5% of GDP. A graphic illustration of the enormous social gulf in this field is the fact[citation needed] that a Spanish family would need to have 57 children to enjoy the same financial support as a family with 3 children in Luxembourg[citation needed].