This document discusses vertical and horizontal marketing systems. It defines vertical marketing systems as consisting of producers, wholesalers, and retailers acting as a unified system to maximize profits for the entire channel. There are several types of vertical marketing systems, including corporate VMS, contractual VMS, and administered VMS. Horizontal marketing systems involve companies at the same level joining together to pursue new opportunities, combining their resources. Both vertical and horizontal systems provide advantages like increased efficiency and satisfaction, but vertical systems also allow for close monitoring and control across levels.