The idea of guaranteeing every member of society an unconditional basic income is one the most innovative and powerful proposals for countering our growing economic inequalities and to sustainably prevent poverty. But would this be a just thing to do? In the last few decades, debates on the ethics and economics of basic income have become increasingly sophisticated and diverse. Basic Income Reconsidered provides an up-to-date assessment of these arguments, and works out a novel contribution based on the justification of unconditional universalism. Birnbaum's argument studies the basic income proposal, and its main rivals, through the lens of John Rawls' theory of justice and defends a radical-liberal interpretation of Rawls' conception. It is radical in the sense that it demands far-reaching equalization of opportunities. It is, at the same time, liberal by insisting that people must be left free to use their resource shares for a much wider range of purposes and life plans than those typically accessible through existing welfare states.