Man experiences a multitude of needs, on whose satisfaction his happiness depends, and whose non-satisfaction entails suffering. Alone and isolated, he could only provide in an incomplete, insufficient manner for these incessant needs. The instinct of sociability brings him together with similar persons, and drives him into communication with them. Therefore, impelled by the of the individuals thus brought together, a certain is established, necessarily followed by exchanges. In brief, we see an emerge, by means of which man can more completely satisfy his needs than he could living in isolation.
Gustave de Molinari