Everything in life is a negotiation, you’ve just decided to end the negotiation. Which is fine. But saying “This is not a negotiation” is all about power and impatience. Saying, “That was good; you almost changed my mind. Here’s why you didn’t” empowers a child and teaches discernment and, yes, negotiation. The key is to teach respectful dialog and that is done by example and practice. It acknowledges and encourages good reasoning in children that aren’t being insolent but care very much about the “whys” in life. Outside of safety issues (“GET OUT OF THE ROAD!”…”Why?”) negotiation shows grace to a child that your power as a parent isn’t something to be lorded over them and contributes to healthy development in the life of a discerning and thoughtful child.