Do you negotiate fairly?
Dozens of books teach how to take advantage of other people. Is that what you really want to do? Or, do you want to create conversations and negotiations that develop your relationships?
If you know a piece of information that could effect your bargainer's position...what if you shared it?
If you know about a technological change that will dramatically impact the price of the thing you're negotiating on -- what if you shared that, too?
If your negotiating partner (not opponent!) is clearly making concessions based on a recently weakened position, do you grab all you can get?
Unless you negotiate fairly you aren't really negotiating.
And only fair negotiations count. Anything else is abuse.
-- Doug Smithy