Rapidly rising home prices and stagnant wages mean Toronto and Vancouver have the dubious distinction of being among the top 5 least affordable housing markets in the world. A new report from think tanks Urban Reform Institute and Frontier Centre for Public Policy used something called the median multiple — a measurement of income in relation to housing prices. The higher the number, the less affordable the market. It found Hong Kong was the least affordable for the 11th year with a score of 20.7.