Commons define the quality of life

Commons are a source of value, out or in complement of the market. For everyone, the ability to resort in commons, besides services provided by the market and the state, has various advantages.
The fact is obvious everywhere shared natural resources such as pastures, water, seas, forests, fields and seeds are the base for survival. Community rights insure free access to those vital resources, payed in cooperative and solidarity money. As soon as the services insured by those resources – human and animal feeding, building materials, medicine, heating and raw materials – have to be bought with money, men are reduced to a state of poverty because they are deprived of purchasing power.
The real tragedy of commons is that people are unaware of their value (not monetary) until the moment they are about to disappear.
Thus, urban population density is a kind of wealth that becomes visible only when lost. Short distances:

• enable to save up the time required to go shopping on foot,

or for the children to go to school without taking public transportation,
encourage socialization's networks and shared work, and therefore the opening of autonomous day-nurseries.
Common resources + Communities + Cooperation = Creation of not monetary values