John Rawls' A Theory of Justice proposes principles of justice to structure an ideal society. Rawls argues that rational individuals in an original position of equality, without knowledge of their social status, would agree to two principles: 1) Equal liberty as long as it doesn't infringe on others' liberty, and 2) Social and economic inequalities must benefit all and be open to all. Rawls believes these principles derived from a social contract theory provide a stronger basis for equality than utilitarianism by denying that infringing basic rights can be justified by greater benefits for more people. He defines justice as fairness under these fair and impartial conditions.