
John Rawls's A Theory of Justice was a strikingly original contribution to political philosophy upon its appearance in 1971. Against the prevailing preference for "meta-ethics" in the field of philosophical ethics, Rawls made an effort to arrive at substantive, non-tautological principles that could be justified as a sort of "moral constitution" for a just society. The theory involves two fundamental principles of justice: the liberty principle, guaranteeing maximal equal liberties for all citizens, and the difference principle, requiring that social and economic inequalities should be the least possible, subject to the constraint of maximizing the position of the least-well-off. (The principle also requires equality...