New development can create demands on more than physical infrastructure. Chief among these is housing. In many metropolitan areas, a great deal of new development creates new jobs at income levels that are insufficient to afford even minimal housing. Worse, school teachers, fire fighters, police officers, nurses, and others who form the social fabric of communities cannot afford to live in new homes that are being built. A growing number of communities are recognizing that while development is mostly good, it may not benefit everyone proportionately. Additionally, because of declining federal and state aid combined with revenue limitations, many communities are looking to the source of impact—new development—to help offset socially undesirable impacts of that development.