“When a white person buys a house, we don’t notice. If somebody of a different colour does, we do. And that’s not good economics.”

Wow, still trying to play the race card? Really??? Shame!
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Yet the 15% tax seems to have had a significant effect on prices. And academics who have studied this issue rate foreign money as the #1 influence. It sure isn't income, as the CMHC is claiming, because there is no way incomes in Vancouver went up 40 fold in a few years. Nor does the CMHC claim (let's not dignify it by calling it analysis) explain two years of 30% increases in price.
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Of course these are the same guys who predicted year after year that prices couldn't keep going up. They are also the same guys who buried research about potential "leaky condo" problems as a result of changes to the federal building code - warnings that could have saved hundreds of millions of dollars and a lot of heartache if only they'd been made public.
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Who told CMHC to say all this? And who got the envelope?