Society originates because the individual is not self-sufficient, but has many needs which he cannot supply himself.
Gist of Idea
People need society because the individual has too many needs
Plato (The Republic [c.374 BCE], 369b)
Notice that Plato has the liberal individualist approach to problem, of starting with isolated individuals, and asking why they need to gang together. This is despite the dependency of children, and the proximity of extended families.
Plato: 'The Republic', ed/tr. Lee,Desmond [Penguin 1988], p.117
Idea 19890 All exchanges in a community are for mutual benefit [Plato]