 The leading contemporary proponent of the harm-based theory is T.M. Scanlon, who argues that contract law imports the moral principles governing harm-avoidance into law (Scanlon 1998: 295–327; 2001: 93–94). Scanlon’s view begins with pre-promissory moral principles that no one could “reasonably reject”, which forbid certain ways of manipulating others and, moreover, require persons to exercise care in leading others to form expectations. Scanlon explains the wrongfulness of lying and imposing misimpressions based on these principles. He then defends a more specific principle of promissory fidelity: