 Every human society has some form of social order, some way of marking and encouraging approved behavior, deterring disapproved behavior, and resolving disputes about that behavior. What then is distinctive of societies with legal systems and, within those societies, of their law? Before exploring some positivist answers, it bears emphasizing that these are not the only questions worth asking about law. While an understanding of the nature of law requires an account of what makes law distinctive, it also requires an understanding of what it has in common with other forms of social control. Some Marxists are positivists about the nature of law while insisting that its distinguishing characteristics matter less than its role in replicating and facilitating other forms of domination. (Though other Marxists disagree: see Pashukanis 1924). They think that the specific nature of law casts little light on their primary concerns. But one can hardly know that in advance; it depends on what the nature of law is.