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		gorharcarme 9 months ago \| parent \| context \| favorite \| on: Denmark to raise retirement age to 70 How do you know that this is separated from other factors, like woman being more educated and have more access to birth control in urban area ? How can we be sure that housing size is the single deciding factor as you said ?

cyberax 9 months ago [–]

You can't know that for certain, but you can look at evidence: the household size increases when people move away from dense cities.

The other way around is more difficult to quantify, and a lot of demographic studies look at immigrants from poor countries.

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