Finding the right car can sometimes be a challenge. But,finding the right car for you on a budget can be even more difficult. For many Americans, buying a used car is the way to go. Did you know that nearly four times as many used cars are sold in the U.S. every year than new ones. Here's an inside look at the used-car industry, comparing the U.S. sales with the rapidly growing market in China. What does this mean for the future of the U.S. auto industry? Here's a look at some facts you should know.