   Relativism, however, comes with a price. Consider this question: What is the content of the basic norm that one needs to presuppose in order to render positive law intelligible as a normative legal order? The simple answer is that what one presupposes here is precisely the normative validity of positive law, namely, the law that is actually practiced by a certain population. The validity of the basic norm, as we noted briefly earlier, is conditional on its “efficacy”. The content of the basic norm of any given legal system is determined by the actual practices that prevail in the relevant community. As Kelsen himself repeatedly argued, a successful revolution brings about a radical change in the content of the basic norm. Suppose, for example, that in a given legal system the basic norm is that the constitution enacted by Rex One is binding. At a certain point, a coup d’etat takes place and a republican government is successfully installed. At this point, Kelsen admits, ‘one presupposes a new basic norm, no longer the basic norm delegating law making authority to the monarch, but a basic norm delegating authority to the revolutionary government’ (PT1, 59).