I've downvoted your comment because the article is referring to a very specific localized housing bubble in Toronto due (potentially) to the behavior of foreign

I've downvoted your comment because the article is referring to a very specific localized housing bubble in Toronto due (potentially) to the behavior of foreign investors. This is not an article about startup or the US stock-market bubble. Addressing your actual comment by paraphrasing Burton Malkiel: "The market can invest irrationally for a surprisingly long period of time."