Many people get nervous when it comes to buying a used car because there are so many variables. Has the car been taken care of properly? Does it have hidden flaws? And most importantly, how much should you pay for it? In a world where most things we buy have price tags, the idea of making an offer on a used car can be nerve-wracking — even frightening. Because there isn't a definitive answer to that vexing question, what is an individual used car worth?