And the housing contagion spreads. For example most of the province of BC that Vancouver has similar housing affordability issues. Same with Toronto and many hours away from it. About %70 of the Canadian population lives somewhere heavily unaffordable.
Then you add the problem that most jobs are in these cities and it makes it even worse.
EDIT:
Look at this list of unaffordable metros for example: http://time.com/money/4193804/hong-kong-least-affordable-cit...
The US stands out as having a good collection of affordable metros, the but rest of the world is worse and california is horrible.