Since the early Twentieth Century, cars have been popular in United States. For the past several generations, one of the primary goals for an American teenager has been to get their driver's license and buy a car. In past years, the only places to find car listings were usually in the local newspaper or auto magazines.
Before the internet, not only were car listings much harder to come by, but information about vehicles in general was, as well. In the past, a typical buyer would either search the newspaper classifieds or go straight down to the dealership. Teenage buyers were more likely to deal with private parties from either classified ads or people they knew, because they were looking for the best deal and didn't mind if they had to fix up the vehicle a little bit. Older buyers tended to purchase from a dealership where they felt some assurance that the car was in good repair.
With relatively few places to look, vehicle choices were fairly limited as well. Often, the only options for a new or used car was at the local dealership, and in smaller communities, there were usually only one or two of those. Because of the limited choices, shoppers often chose to buy brand new vehicles, because even though they were more expensive than the used variety, they tended to be in greater supply and offered more options for people who were more particular about what they wanted.