Never fear to negotiate . . .?
Sometimes you should say no to negotiation. If you’re happy with the status quo, for example, or certain that you can get a better deal from somebody else, there may be no reason to talk other than demonstrating good will.
Likewise, you shouldn’t negotiate if the transaction is dubious morally. When a customer demands a kickback as condition for making a sale, walk away (rather than haggle over the amount of the bribe).
And you might also say no to talking if your willingness to negotiate could be misread as a sign of weakness. Of course, when both parties are reluctant to start a dialogue, they can get mired in costly impasse.