# 240.13 Customer's and third party liability.
(a) *Customer's liability.* Sections 2(d) and (e) apply to sellers and not to customers. However, where there is likely injury to competition, the Commission may proceed under section 5 of the Federal Trade Commission Act against a customer who knows, or should know, that it is receiving a discriminatory price through services or allowances not made available on proportionally equal terms to its competitors engaged in the resale of a seller's product. Liability for knowingly receiving such a discrimination may result whether the discrimination takes place directly through payments or services, or indirectly through deductions from purchase invoices or other similar means. In addition, the giving or knowing inducement or receipt of proportionally unequal promotional allowances may be challenged under sections 2(a) and 2(f) of the Act, respectively, where no promotional services are performed in return for the payments, or where the payments are not reasonably related to the customer's cost of providing the promotional services. *See, e.g., American Booksellers Ass'n* v. *Barnes & Noble,* 135 F. Supp. 2d 1031 (N.D. Cal. 2001); *but see United Magazine Co.* v. *Murdoch Magazines Distrib., Inc.* 2001 U.S. Dist. Lexis 20878 (S.D.N.Y. 2001). Sections 2(a) and 2(f) of the Act may be enforced by disfavored customers, among others.
(b) *Third party liability.* Third parties, such as advertising media, may violate section 5 of the Federal Trade Commission Act through double or fictitious rates or billing. An advertising medium, such as the Internet, a newspaper, broadcast station, or printer of catalogues, that publishes a rate schedule containing fictitious rates (or rates that are not reasonably expected to be applicable to a representative number of advertisers), may violate section 5 if the customer uses such deceptive schedule or invoice for a claim for an advertising allowance, payment or credit greater than that to which it would be entitled under the seller's promotional offering. Similarly, an advertising medium that furnishes a customer with an invoice that does not reflect the customer's actual net advertising cost may violate section 5 if the customer uses the invoice to obtain larger payments than it is entitled to receive.