Because land speculation tends to cause volatility in property values, removing real estate (houses, buildings, land) from the open market freezes property values, and thereby prevents the economic eviction of the community's poorer residents. The most common, formal legal mechanism for such stability in English speaking countries is the community land trust; moreover, many inclusionary zoning ordinances formally place the "inclusionary" housing units in a land trust. German municipalities and other cooperative actors have and maintain strong roles on the real estate markets in their realm.