Used car dealers purchase vehicles for inventory at wholesale, which is also known as ACV (Actual Cash Value) from auctions, other dealers and private individuals such as yourself. Several factors are used to determine ACV, for example, market value, supply and demand, press and overall condition.
Supply and Demand
Fleet companies rotate their cars out of service and through the auto auction which causes supply and demand on certain models to change. Also, popular models that are at the end of a lease can cause a glut on the market, which will have an effect on supply and demand.
Press
Sometimes vehicles receive positive or negative press, which can affect the prices of the vehicles.
Overall Condition
This refers to the abvoius everyday things that you see in a vehicle; milage, paint condition, exterior appearance and condition, tires, brakes, and mechanical aspects.
A good place to get an estimated user car value on your trade in is http://www.kbb.com or http://www.nadaguides.com.
Don't forget to print out the valuation pages and bring them into Labadie with you!