This document discusses different types of middlemen and their functions, as well as wholesalers and retailers. It defines middlemen as traders who buy from producers and sell to retailers or merchants. The main types of middlemen are brokers, factors, commission agents, underwriters, traveling agents, and auctioneers. Wholesalers buy large quantities from producers and warehouse and resell to retailers, providing services like financing, risk bearing, and market information. Retailers purchase from wholesalers and sell directly to consumers, performing functions such as assembling products, warehousing, grading, packing, financing, market research, and advertising.