Oh and back on the buying houses thing
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Not sure the scope of cities included here from say Europe, and it's pre-pandemic so they have gone up more since... but it's completely insane that Caloundra is as unaffordable as San Francisco lol
According to the source, it essentially only includes the countries listed here. Which is the only way this makes sense, because many continental European cities would be above Vancouver.
I found more comprehensive data here:
Property Prices Index 2023
Property Investment Index. See comparison of indicators for residential property investment like apartment price to income ratio, price to rent ratio, gross rental yield, loan affrodability index, ...
Here Vancouver ranks at place 129, and there is more than 50 European cities above it. Houses in English-speaking countries seem to be affordable in comparison*. So I don't think this is the explanation for the effect described in the OP. If anything, the data suggest an inverse relationship (wild hypothesis: High housing prices make young families move to more rural areas where they become more conservative?)
*There is one curious effect though: In Canada and New Zealand (but not the UK and US), the actual house prices compared to income are not that bad, but the mortgage as percentage of disposable income is quite high (on the level of European cities). Which means that either interest is much higher or that they are paying much more for something else.