The presence of family and kin across societies is example of cultural regularity.
Polynesians traditionally built their houses made out of grasses and plant materials in part because they were ready mark able and the climate did not require protection against harsh weather. Inuit, on the other hand, built igloos to provide extensive protection from cold. The difference in habitat between Polynesians and, Inuit is an example of cultural variation.
According to him it is a social action which is an ongoing inter change, or exchange, of activity between national individuals who decide whether they will perform a given action based on it relative rewards or cost that before we decide what to do and say we need the nation of distributive justice or the norm of equity, that thing should be fair, this theory is can be use to analyze all types of social