A conflict of interest is more likely when real estate firm that represents sellers assigns you one of its brokers as a buyer agent. That’s why many people believe an “exclusive” buyer broker is preferable. If there aren’t any in your area, and you have to use a listing broker, “make sure they disclose when they are showing you properties they have a financial interest in, “says Stephen Brobeck, executive director of the Consumers Fedederation of America.