Abstract

Custom is a complex phenomenon, and one that is hardly given a satisfying account, especially if it is assumed, as many legal positivists do, that law is only produced through acts of will. After examining five main reasons for the complexity of custom, I will consider Uberto Scarpelli’s thesis that customary law can be given an account within legal positivism through a reinterpretation of norm-generating facts as the manifestations of a will. But what kind of will is implied here, and how can the underlying norm be inferred? I will first briefly examine Gaetano Carcaterra’s analysis of abduction as a method to infer norms from behaviors, and then distinguish six different forms of will possibly implied in a behavior which is relevant for the formation of a customary norm. I will finally focus on norm-oriented, or nomotropic will, and especially on nomotrophic will, that is, the will –implied and expressed in the reaction to the violation of a norm– that the infringed norm be valid.