We model a boundedly rational agent who suffers from limited attention. The agent considers each feasible alternative with a given (unobservable) probability, the attention parameter, and then chooses the alternative that maximises a preference relation within the set of considered alternatives....

Consumers are assumed to be unable to discriminate between two goods of differing qualities provided that the qualities are close enough. It is shown that in a vertically differentiated duopoly this results in multiple equilibria. Demand for each firm's good is reduced. Firms' profits may be...