The agent middleman negotiates purchases and/or sales but does not take title. They receive revenue from commission or fees which are paid by the buyer, or seller of the merchandise, but seldom both. The agent does not represent both the buyer and the seller in the same transaction. He may represent the seller and buyer in different transactions however. The classes of agent middlemen are: (1)broker; (2)commission merchant; (3)resident buyers; (4)manufacturer’s agents; and (5)sales agents.