Dont give anything away without getting something in return

Don't give anything away without getting something in return. Unilateral concessions are self-defeating. Whenever you give something away, get something in return. Always tie a string: "I'll do this if you do that." Otherwise, you are inviting the other negotiator to ask you for additional concessions. When you give something away without requiring them to reciprocate, they will feel entitled to your concession, and won't be satisfied until you give up even more. But if they have to earn your concession, they will derive a greater sense of satisfaction than if they got it for nothing.