 Most contemporary versions of the principles discussed so far allow some role for the market as a means of achieving the desired distributive pattern—the Difference Principle uses it as a means of helping the least advantaged; utilitarian principles commonly use it as a means of achieving the distributive pattern maximizing utility; desert-based principles rely on it to distribute goods according to desert, etc. In contrast, advocates of libertarian distributive principles rarely see the market as a means to some desired pattern, since the principle(s) they advocate do not ostensibly propose a ‘pattern’ at all, but instead describe the sorts of acquisitions or exchanges which are just in their own right. The market will be just, not as a means to some pattern, but insofar as the exchanges permitted in the market satisfy the conditions of just acquisition and exchange described by the principles. For libertarians, just outcomes are those arrived at by the separate just actions of individuals; a particular distributive pattern is not required for justice. Robert Nozick advanced this version of libertarianism (Nozick 1974), and is its best known contemporary advocate. 