Final answer:
The commission paid to the buyer's broker by the seller is generally established in a listing or broker agreement and is a percentage of the sale price or a fixed amount.
Step-by-step explanation:
The amount of commission to be paid to the buyer's broker by the seller is usually determined by a pre-negotiated percentage outlined in a listing agreement or broker agreement. This commission is typically a percentage of the sale price of the property. When a seller lists their property for sale, they agree to pay a specific commission to their listing agent who then often splits this commission with the buyer's broker if another agent brings the buyer to the table. In some cases, the commission rate may be a fixed amount regardless of the property's sale price.