What negotiation skills are required to satisfy a customer even for valued price?

when you feel that client need negotiation.keep your face little bit changes to because they will under estimates .
please make words on demands

If you want to convince a customer, you need persuasive skills, negotiation ends if you feel the price is right in this case, you cannot and shouldn't negotiate a customer into convincing that the product is rightly priced, that would exert force.

 a principled type negotiator using accommodating or collaborating negotiation styles are the best in this situation.