You're not supposed to know about it. It's a secret fee that dealerships across the country are charging customers, that can add thousands to the cost of their car. KHOU got their hands on insider documents provided to them by a former dealership worker that shows how it works.
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http://consumerist.com/2011/05/the-hidden-fee-thats-adding-thousands-to-price-of-your-new-car.html