Price Discrimination by a Many-Product Firm
研究多产品企业面对消费者不可观测偏好时的最优销售策略，发现产品数量大时，几乎最优的非线性关税形式简单：偏好独立时可用单一成本基础两部收费提取全部消费者剩余；偏好相关时可用两部收费菜单实现。
Determining the optimal selling strategy for a multiproduct firm facing consumers with unobservable tastes is a difficult task. This paper aims to show how almost optimal nonlinear tariffs can often be found when the number of products is large. Moreover, such tariffs take a simple form: (i) when taste parameters are independently distributed across products, the almost optimal tariff is a single cost-based two-part tariff which can extract virtually all consumer surplus; (ii) when tastes are correlated across products, perhaps because of income differences across consumers, the almost optimal tariff can be implemented as a menu of two-part tariffs each of which has prices proportional to marginal costs.