 For clarity, note the ambiguity in the sense in which a legal rule is “efficient” in claims (II) and (III). In the most straightforward, economic interpretation, claims (II) and (III) refer to the efficiency of the behavior induced by the legal rule. Claims (II) and (III) therefore seem to presuppose claim (I). Many, if not most, economic analyses of law, however, assert only that the legal rule is efficient within some  model.[2]  A judge, policymaker, or analyst might believe, on the basis of the efficiency of a rule in a model, that the rule induces efficient behavior in the world but the efficiency of the rule in the model does not logically entail efficiency in the world. 