Justice, Consent, Self

When an exchange is unjust, e. g. due to misrepresentation, it is a violation of Retributive Justice, i. e. one party does not receive what they had taken to be commensurate with what they had given. So, implicit in such judgments is that the consent of a party suffices to ratify such commensuration. However, one's consent to purchases that are harmful to one, e. g. cigarettes, junk food, etc., is not uncommon. Hence, one can be unjust towards oneself.