Liberal Foundations of Basic Income. Argument Combining Philosophy and Economics[Fondements libéraux du revenu d’existence. Une argumentation combinant philosophie et économie]

Debates among Liberals on social justice have played a major role in current discussion on basic income (or universal benefit). In this paper, the notion is considered on the basis of the "economics of liberal egalitarianism", for which the anchor point is to be found in Rawls' philosophical works. Although this author certainly does not support basic income, he still provides an appropriate general framework to consider it, in particular through the hierarchy of his principles of justice (I). At the third level of this hierarchy, the interpretation of the "principle of difference" appeared controversial concerning the treatment of "Malibu surfers", through which Van Parijs can have defended the unconditional nature of basic income (II). There remains the transition from the philosophy to the economics of basic income, which allows considering it as a precise alternative of negative income tax. At this stage, a rereading of Friedman's intuition on this topic results in seeing basic income as a "universal tax credit" (III). We conclude with some brief remarks on the general rules necessary for a possible implementation of this conception of basic income in the case of France (IV).