That said, and with the caveat that I'm not a trained economist, I don't believe that 'the market' is the only way of looking at society. Though minimal regulation recommends itself as the best way to avoid providing short-term relief for a specific economic group at the expense of the long-term health of a whole society, a degraded people can wreak havoc with a good economic system, just as a people without virtue can wreck the best of political systems.
America ripped across its territory in record time and figured out how to produce not only enough for its own people, but a vast surplus for the hungry in other parts of the world. Most of this happened thanks to private or local ingenuity and enterprise. That spirit continues to create innovations and advances at a level unknown in the world for many thousands of years.
Black Friday is a corruption of that beneficial system. There is a difference between inventing the technology to produce iphones and flat screen TVs and shoving or even trampling someone to get such products at half price. A minimally regulated market has proven itself at surmounting obstacles and benefiting people across the board, but it is only as moral as the people who comprise it. Supply and demand form, in this case, a kind of vicious cycle - when enough stores offer huge discounts and have consumers camping out in their parking lots, it is competitively advantageous for others to join in - and the greed of consumers makes the stores look greedy, and vice-versa. The market responds to demand, and even when demand is trumped-up or superficial, resources still pour into it.
Black Friday isn't a problem with the free market, it's a problem with people. Unrestrained greed will taint any economic system, and in our society, where marketing relies on invented needs and material goods are status symbols, greed is an important god in our social pantheon. Minimally-regulated markets become sinkholes for the petty desires of unsatisfied consumers, and after the pushing and shoving are over, we have a few new TVs and BluRay players, and we have improved ourselves not a whit.