Final answer:
ReaderLink is a company that is both a wholesaler and an upstream channel member, servicing retailers with distribution of books from publishers to various retail outlets, but does not sell directly to consumers.
Step-by-step explanation:
ReaderLink is a company that operates as both a wholesaler and upstream channel member, meaning that it services retailers by distributing books from publishers to various retail outlets, including bookstores, supermarkets, and warehouse clubs. ReaderLink does not sell directly to consumers, distinguishing it from a retailer. Its role in the supply chain is crucial, as it handles aspects like inventory management, category management, and distribution, ensuring that books reach shelves efficiently and according to market demands.