[lacrew]

First rule of negotiating - be prepared to walk away.

[BlueStateRightist]

“First rule of negotiating - be prepared to walk away.”

Yes. The concept is called BATNA. See https://en.wikipedia.org/wiki/Best_alternative_to_a_negotiated_agreement

[reed13k]

And the second is sometimes there isn’t a solution agreeable to both parties. See rule 1.