A well-functioning housing market should allow people to move house when their own circumstances or the general environment changes. The ability to move is a virtue and rental housing generally allows such movement. It is society’s general interest to develop a housing system that allows people to find accommodation that matches their needs at any given point in their lives. In such a housing system, the ability to move from one home to another, from one city to another, from a small house to a large one and vice versa, is critical. Mobility is only a problem when people are forced to move when they do not wish to