What is a dealer addendum sticker on a new car? in Olive Branch, MS

Great question. From a car buyer's perspective, neither of these things should be a factor in any of your negotiations. The Manufacturer's Suggested Retail Price is technically what a manufacturer thinks a dealer should charge for a vehicle, but as you well know, in the real world cars sell for whatever a buyer can get a dealer to agree to. Whether it's well below or well above MSRP is due to supply and demand, as well as the negotiation skills of the buyer.