NEGOTITATOR

Getting something you value highly for something you value less. Bargaining is based on the exchanging something for something.

When you buy food in exchange for cash you value the food more than you do the cash, otherwise you would stay hungry. The seller values the cash more than the food; otherwise they would do without the cash. At eh moment of the trade you each get a bargain.

To bargain, discover what you have that the other party values highly and what they have that you want.