What a difference a year makes, because in the latest report by UBS wealth Management, which compiles the bank's Global Real Estate Bubble Index, it found a new champion for the title of "world's biggest housing bubble", namely a familiar name, Vancouver, but also that as many as six cities had made the "bubble" category, up from last year's two. Of last year's two "winners", London has been knocked into second place this year, and Hong Kong sixth, but both are still in bubble-risk territory.

Looking at soaring home prices across the globe, UBS has concluded that low interest rates have now created a new global housing bubble in major cities around the world, with Vancouver and London most at risk. Not surprisingly, the Swiss bank notes that ultralow interest rates at global central banks have contributed to overheating in the housing market in recent years.