Hon DAVID PARKER (Minister for the Environment): I thank the member for the question. I actually largely agree with his proposition that artificial constraints on land supply have driven up land prices and that those increases in land prices have flowed through to the cost of all housing, because it's the marginal cost of the new that effectively leads the market. Now, the way that we've approached that under the Resource Management Act (RMA) is through the only tools that we have under the RMA, which are to issue national direction requiring councils to make room for growth, essentially.