Functional relations are of two kinds: they refer to the interaction that is established between the self and the other in terms of role, but they can also describe some aspects of interdependence, some social situations in which the individual becomes totally anonymous (Schmidt 26). According to the conflict theory, society is based on class and social struggle. The main elements of this theory are competition, structural inequality, revolution and war. Each individual and social class struggles to improve its social conditions and maximize benefits. Revolution created two classes, bourgeoisie and proletariat and that their relationship is largely antagonistic, for some episodes in history can be understood only with this conflict in mind. The relationship between capitalists and workers ceases to be completely free and elements of both co-operation and conflict are part of it. This theory views the social world as a struggle (antagonism) between the main classes (Schmidt 102-103). For instance, labor union aggressiveness can stimulate productivity and, thus, be of benefit to everyone. Symbolic interactionism focuses on the aspect of social life explained through the use of symbols.