principles governing the efficient laws from an economic analysis of law

the law is important on point of law and economic movement. in fact, one of the production in the field of fiction markets is law and regulations. in the literature of law and economic, there is different between two laws. means that , we ought to distinguish between efficient and inefficient laws. so, there are some characteristics relation to efficient laws. this characterics are effect in the process of enforcement of law. some of them are includes transparency, rationality, validity, accessibility and so on. in this article , we try to show that welfare social or established balance system are based on the efficient law.