The article presents an unified theoretical model in which the postulates encompass simultaneously the mental and the social, social microphenomena and social macrophenomena. Accordingly, the possibility of ampleness remains open to many theorems deduced or deducible from the axioms.The model is confronted with a pretended methodological autosufficiency of collectivistic approaches in social thought and with the assumption, atributed to utilitarian theories (including expected utility theories), that individuals are rational in their behavior.The article maintains that the choice between alternatives (to be (...) made individually or socially) can be viewed with more comprehensiveness and consequently with a higher explanatory power if explicitly referred to the general basic traits of human mind (feeling-idea-volition). (shrink)