ABSTRACT
The social actors’ reason is bounded; their aspirations are mostly determined endogenously and are strongly conditioned by externalities of any kind; their actions are moved by heterogeneous mental feelings in which altruistic and egoistic sentiments can be simultaneously present; their egoism often induces them to transgress social rules and even the obligations voluntarily undertaken; their knowledge and information are limited and asymmetrically distributed; their social environment is continually changing and radically uncertain; finally, their relations are constituted through transactions in which the principle of equivalence does not hold.
