It is also called brokerage contract, brokerage contract or brokerage contract. A voluntary contractual agreement may exist between two parties, including a buyer or seller on the one hand and a broker on the other. The broker facilitates transactions between the buyer or seller and a third party which may be an airline, insurance company, equity fund, wholesaler, communications company or other active party. Brokerage contracts have in common certain fundamental principles. The easiest way to prove the existence of a contract is a written document signed by both parties. It is also possible to impose an oral contract, although some types of agreements would still require a written contract to have legal weight.