>> It is ESTIMATED that dirty money pushed B.C. home prices 3.7% to 7.5% higher than they would be in the absence of laundering."
> So yes it has an effect, but it IS a tiny proportion of the price, something on the order of 5%."
"...it is a tiny proportion of the price..."
Technically, the degree to which it affected prices is unknown. Our understanding of market pricing is far from sufficient to make any confident and specific (to one decimal place no less!) assertions about how much of price increases were "caused" by money laundering. Market behaviors (price & volume) can bleed over into the realm of human psychology, setting off a self-reinforcing feedback loop of greed. When this happens, setting of another x% of price increases, is it correct or incorrect to say that particular portion was caused by the demand from money laundering? Once again, the correct answer is: we do not know.
Any claims by anyone on this specific subset (the degree to which is certain things caused particular price increases) of the topic is inherently speculative, for more reasons than just the one outlined above (another obvious reason is, several of our input variables into the price increase model are themselves estimates).