Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
A model of advertising is presented in which consumption experience is an imperfect indicator of product quality. In equilibrium, neither price nor advertising signal the quality of newly introduced goods. Advertising of established products can be a signal of quality, but if it is, it must be an imperfect signal leaving residual uncertainty that influences consumers' repurchase decision. A set of observable implications follow. Copyright 1994 by MIT Press.