Dual Agency occurs when a single real estate agent represents both the buyer and seller in a real estate transaction.A dual agent must be loyal to both the buyer and the seller. A buyer wants their agent to negotiate for the lowest possible price, while a seller wants the highest possible price.The conflict of interest for a dual agent is clear, and in many states dual agency is not allowed.If it is allowed, both parties must usually agree to it in writing. buyer wants their agent to negotiate for the lowest possible price, while a seller wants the highest possible price. The conflict of interest for a dual agent is clear, and in many states dual agency is not allowed. If it is allowed, both parties must usually agree to it in writing.