There's One Big Driver In The Hong Kong Housing Boom, And It's Not Supply
Business Insider - USA
(...) The next step is to estimate the required net supply level that would keep the surplus-to-total-private-sector-housing-stock ratio roughly constant. I take the population projection by United Nations Population Division, and assume that the average household size to be constant at 2.9 (as it currently is) to estimate the annual increase of the number of households. (15 March 2011)