27 CFR 6.51: General.

The act by an industry member of paying or crediting a retailer for any advertising, display, or distribution service constitutes a means to induce within the meaning of the Act, whether or not the advertising, display, or distribution service received by the industry member in these instances is commensurate with the amount paid therefor. This includes payments or credits to retailers that are merely reimbursements, in full or in part, for such services purchased by a retailer from a third party.