"Under all is the land, Upon its wise utilization and widely allocated ownership depend the survival and growth of free institutions and of our civilization.  REALTORS should recognize that the interests of the nation and its citizens require the highest and best use of land and the widest distribution of  land ownership. They require the creation of adequate housing, the building of functioning cities, the development of productive industries and farms, and the preservation of a healthful environment.:  Preamble of the National Association of REALTORS Code of Ethics