Negotiation is an art wherein the best move is to think of an incentive the other person hasn't even thought of and then meet it.
Negotiation is that whereby one would do well to remember that the person with whom one is dealing is not a creature of logic. He is a creature of emotion, bustling with prejudices and motivated by pride and vanity.
Negotiation is best conducted by beginning with an extreme position — if you want a kitten, start out by asking for a horse.
Negotiation is not a policy. It's a technique. It's something you use when it's to your advantage, and something that you don't use when it's not to your advantage.
Negotiation is an activity whose macro is that a deal can only ever be cut when both sides are hurting. If either side is is well and feeling happy, you can't get a deal. Then they go for victory. You need if they're willing to settle for things the other side can live with, it's because they're hurting a little bit.