Inattentive Consumers and Product Quality

We present a model in which some consumers shop on the basis of price alone, without paying attention to product quality. A firm may "cheat" and offer a worthless product to exploit these inattentive consumers. In the unique symmetric equilibrium, firms follow a mixed strategy involving both price and quality dispersion. The presence of inattentive consumers harms attentive consumers, and enables firms to earn positive profits. With many sellers, approximately half of them will cheat. A market transparency policy which boosts the number of attentive consumers will make firms less inclined to cheat, which improves welfare, but the impact of the policy on profit and consumer surplus is ambiguous. (JEL: D18, L13, L15) (c) 2009 by the European Economic Association.