In your negotiations, consider the value of happiness. That means, think about how you can alter your mind per how you value situations and make them serve you and the goals you have for the negotiation; consider how you can put the other negotiator into a more positive state of mind, too.
The reason you should consider your state of happiness and that of the other negotiator is because the negotiation will flow easier to the degree that both of you are happy. Thus, if you know what makes you happy and how to summon that sensation you’ll be able to tap into it. Doing the same for the other negotiator will give you subconscious powers in the negotiation.
Observe the Negotiation Infographic Tip for more insight.