||The purpose of this thesis is to critically evaluate the way how neoclassical economics describes human behaviour. Most important fact is considered to be that people, during their lives, are becoming members of many communities which more or less influence their decision making. First chapter of this thesis deals with human rationality from different points of view. Following chapter describes theories and types of communities. Thesis also includes mathematical models which show possibilities of economic survival of each member of the community in dependence on their relationships and involvement. Following chapter contains basic theory of Labor – Managed companies. Last chapter describes factual communities in which solidarity and involvement plays crucial role for their survival.