1) A vertical marketing system is a network of two or more levels of channel members such as manufacturers, wholesalers, and retailers.
2) A corporate vertical marketing system combines successive stages of production and distribution under single ownership, with channel leadership established through common ownership.
3) A contractual vertical marketing system consists of independent firms at different levels integrating their programs on a contractual basis to achieve greater efficiencies and sales impact than operating alone. There are three main types: manufacturer-sponsored retailer franchises, manufacturer-sponsored wholesaler franchises, and service-firm-sponsored retailer franchises.