There are ways to increase supply of houses. Twyford could return to his idea about the urban limit. He could look at a massive development of a new sub-city between Auckland and Hamilton, as proposed some years ago by right-wing Auckland mayoral candidate John Palino and left-wing Auckland urban geographer Ben Ross. A tax on land-banking might quickly bring Auckland's 30,000 empty houses on the market. Labour and its Green allies could drop their doctrinaire opposition to comprehensive Resource Management Act reform. - www.nzherald.co.nz