Final answer:
A buyer representation agreement needs to be in writing to be enforceable, allowing the broker to earn a commission. Oral agreements are generally not sufficient in real estate transactions due to legal requirements.
Step-by-step explanation:
The question concerns the conditions under which a broker is entitled to earn a commission through a buyer representation agreement. Specifically, it asks about what is required for such an agreement to be valid and enforceable. In most cases, a buyer representation agreement needs to be in writing to be legally binding and enforceable, which is crucial for the broker to earn a commission. While some agreements can be oral, written contracts are generally required in real estate transactions to meet statutory requirements such as the Statute of Frauds, which requires certain contracts to be written down and signed by both parties involved.