16 CFR §240.7

The terms “services” and “facilities” have not been exactly defined by the statute or in decisions. One requirement, however, is that the services or facilities be used primarily to promote the resale of the seller's product by the customer. Services or facilities that relate primarily to the original sale are covered by section 2(a). The following list provides some examples—the list is not exhaustive—of promotional services and facilities covered by sections 2(d) and (e):