Earlier quoted context omitted.
Not everyone is mortgaged - quite a lot of the price rises are driven by foreign capital flight. A few places have figured this out and decided to tax it: https://www.bloomberg.com/news/articles/2018-02-20/british-c...
I've noticed this annecdotally when trying to buy a home on separate occasions in the New York and LA metro areas. I'm not sure it's foreign capital, but the majority of winning bids were all cash offers above the asking price. I'd love to see a retrospective analysis on Vancouver's protective measures to see if they did actually help, or if buyers found loopholes, or it wasn't Chinese buyers to begin with.
It brought in some extra money to Vancouver though.