We learn to share when the social conditions to do so are created. People are not possessive from birth. By creating an cultural environment, an organization where sharing has advantages for those who share. For example, If I share my car with community members, and they maintain it, repair it and help me to keeping it in better shape than I can alone, they reinforce my sharing behavior. On the contrary, if I share my car with members who misuse it or damage it, it will discourage my sharing behavior.
Community rules on the use of community property are important to encourage and reinforce sharing.
Yes, thanks to our practice of sharing property, we make a thorough use of things. More people use them, reuse them and recycle them. Few things are just sitting there waiting to be use. We do not need as much money as people who do not share do. By sharing cars, electrical appliances, tools, books, clothing and everything not every family or single member needs to have a car, a stove, a T.V. ,etc.