 If corrective justice cannot be subsumed normatively under distributive justice, we need to explain its value. What is achieved when we make Bill return the computer to Alice? Aristotle (Nicomachean Ethics, Book V, ch. 4) suggested that corrective justice aims to restore the two parties to a position of equality; by returning the computer we cancel both Bill’s unjustified gain and Alice’s unjustified loss. But this assumes that the computer can be returned intact. Corrective justice requires that Alice be made no worse off than she was before the theft, even if that means Bill suffering an absolute loss (e.g. by paying for a new computer if he has damaged Alice’s). Aristotle himself recognized that the idea of evening out gain and loss made no literal sense in a case where one person assaults another and has to compensate him for his injury – there is no ‘gain’ to be redistributed. It seems, then, that the value of corrective justice must lie in the principle that each person must take responsibility for his own conduct, and if he fails to respect the legitimate interests of others by causing injury, he must make good the harm. In that way, each person can plan her life secure in the knowledge that she will be protected against certain kinds of external setbacks. Philosophers and lawyers writing on corrective justice disagree about what standard of responsibility should apply – for example whether compensation is required only when one person wilfully or negligently causes another to suffer loss, or whether it can also be demanded when the perpetrator displays no such fault but is nevertheless causally responsible for the injury.