 There are three species of property arrangement: common property, collective property, and private property. In a common property system, resources are governed by rules whose point is to make them available for use by all or any members of the society. A tract of common land, for example, may be used by everyone in a community for grazing cattle or gathering food. A park may be open to all for picnics, sports or recreation. The aim of any restrictions on use is simply to secure fair access for all and to prevent anyone from using the common resource in a way that would preclude its use by others. Collective property is a different idea: here the community as a whole determines how important resources are to be used. These determinations are made on the basis of the social interest through mechanisms of collective decision-making—anything from a leisurely debate among the elders of a tribe to the forming and implementing of a Soviet-style ‘Five-Year Plan’.