I think there is another possibility of knowing the value your product gives the customer compared to the competition. Stay firm on that unless the client is es

I think there is another possibility of knowing the value your product gives the customer compared to the competition. Stay firm on that unless the client is essential for your budget. Once a man like that learn that you are not easily manipulated, he either stops being unreasonable, or he doubles down and gladly spend more money on an similar or even inferior product. In the latter case you did not want his business long term anyway, unless you had to.