There are some interesting charts in these two tweets.
First, one person points out that Europe has a much higher total dwelling stock per person than Anglophone countries:
Then another person responds by showing a map of Common Law vs Civil Law countries, suggesting that Common Law makes it hard to build housing:
I thought this was interesting, but then I looked up a map of home price per average income by country:
While the Anglophone countries may have a lower total dwelling stock per person, they also seem to have more affordable housing than the European Civil Law countries.