A monopoly seller advising buyers about which of two goods fits their needs may be tempted to recommend the higher margin good. For the seller to collect information about a buyer’s needs and provide truthful advice, the profits from selling both goods mu Lien vers l'article
BARDY, D., GROMB, D., MARTIMORT, D. and POUYET, J. (2020). Controlling Sellers Who Provide Advice: Regulation and Competition. Journal of Industrial Economics, 68(3), pp. 409-444.