Shop around, and bring proof. If yo

Shop around, and bring proof. If you are buying a car and you know the other dealer will sell you the same car for $200 less, tell them so. Tell them the name of the dealer and salesman. If you're negotiating a salary and you've researched how much people in equivalent positions get paid in your area, print out those statistics and have them handy. The threat of losing business or opportunity, even if it's not a serious one, can make people compromise.