While residential developments along establish roads ways are to be encouraged since they take advantage of existing infrastructure, they are problematic when the costs of servicing these areas are bom by the municipality and the externalities associated with such a location are not reflected in the costs paid by home owners. This is to be expected to some degree as lower interest rates increase an individual’s ability to purchase a property. Supply constraints also increase demand—for instance, high demand to live in a particular area because of its amenities or cultural heritage. In comparison to other departements in the region, these are low figures, Puy-de-Dome had the lowest percentage change in terms of housing prices over the period and the second lowest in terms of household income.