Remember when you were young? The ultimate insult was that the shoes on your feet or the clothes on your back were KMart bluelight specials. Somehow having parents who were thrifty was a social gaffe in the highest degree. (as if you had even the slightest control over where your parents shopped) Getting a good deal was a curse and if people found-out it could somehow impugn your character and even worse your popularity. There was even a major hit by a superstar of note who no one would ever confuse with the mother of Christ boldly titled "Material Girl". It was an age of consumerism.
Though there have been many groups of teens who avoided this materialism (punk and grunge spring to mind immediately) it has steadily grown. The kids who would ridicule each other in the school yard became the parents who bought $50 Air Jordans for their 1 year-olds and frequented toy boutiques because everyone knows "it" is better if you spend more. But, then came the dollar stores, warehouse stores, and discounted and outlet stores. Steadily a change began in the most consumer population known to America - the teens.