 Unlike utilitarianism, therefore, contractualism rejects the interpersonal aggregation of burdens. (We discuss some important exceptions below.) This is one of the main respects in which it differs from utilitarianism. Contractualism thus captures a key feature of our moral life that, as Rawls famously argues, utilitarianism ignores: the feature he calls “the separateness of persons” (Rawls 1971). Instead of lumping everyone together and allowing one person’s rights to be trampled to provide greater aggregate benefits to others, contractualism recognises that each of us has a unique life to live. Contractualism therefore seeks principles that benefit each person individually and that command each person’s free assent.