In my 市场营销 and when talking to prospective clients, I say that I charge the standard commission for my city. 这样可以吗??

No. There is no such thing as an industry-standard commission rate. 卖家 decide what fee they are willing to pay for their broker’s services and how much that listing broker should offer a broker who brings a buyer to close the transaction. Compensation is always negotiable, and 消费者 are encouraged to talk to their broker to understand and agree upon how they expect to be compensated.