Seller honesty and product line pricing

We study upselling in markets where the seller observes consumer need but the consumer herself may not (e.g., medical care, durable repairs, financial and legal services). The seller may recommend excessive product features to uninformed consumers. In a monopoly with two types of consumer (one with a basic need and the other an advanced need) and two types of service (a basic service which fulfills only the basic need and an advanced service which fulfills both needs), we investigate the firm’s honesty and product-line pricing. We reach several results. First, the firm is honest if the basic service is superior (in that it generates higher per-capita social surplus than the advanced service under the efficient allocation) or if the consumers with the basic need are sufficiently many. Second, when there exist informed consumers who neglect seller recommendation, the presence of informed consumers may cause consumer welfare to decrease, and a larger informed population may cause firm profits and social welfare to increase or decrease. Lastly, when the informed consumers boycott a dishonest firm and withhold purchase, firm profits may increase because the threat of boycotting makes the firm more credible and allows a higher price of the advanced service.