In a sale, the real estate agent's role is to be the “middle man" of the parties, without favoring the specific interests of one or the other. This is the concept of real estate brokerage, that is, bringing together supply and demand by reaching the best possible agreement.
Contrary to popular belief, reaching an agreement on the price in a sale is only the tip of the iceberg. In fact, between this and the final sales contract there are:
The terms of payment and delivery.
The methods of payment and any checks on the legitimacy of the transfer.
The manner in which the goods will be delivered
The notary who will take care of the deed.
The bank that will finance the project.