The Uses of Power in Negotiating
YOU ALMOST ALWAYS have more power in a negotiation than you think you have. Even when you feel that the other person has all the power, it may be that you have something that he wants, or you can find something that he wants that will swing the balance of power back in your favor.
There are several ways that you can increase your power in a negotiation, including through preparation, authority, knowledge of the other party, empathy, rewarding/punishing, and investment.
The Power of Preparation
The more thoroughly prepared and knowledgeable you are when you go into a negotiation, the greater power you will have. Do your homework. Robert Ringer, a skilled negotiator, talks about taking an accountant, lawyer, ...