Advertising can be regarded as having two separate functions, one of persuading and one of informing consumers. Against some who claim that persuasive advertising using irrational means is moral as long as the product or service it represents is good or useful, this paper argues that by denigrating human reason such advertising is always immoral. On the other hand, advertisements which present information in a straight-forward and truthful way are always moral no matter what they advertise; indeed, only such advertisements (...) are moral. (shrink)