I remember watching a show on NBC, or one it's other channels, and they were doing a documentary about Walmart. There factories are incredibly complex and insane. Everything you buy is sent to a central database within minutes of your purchase and is analyzed by the computers who determine what products are needed at various stores around the country, so they can send them out instantly. It is some crazy complex system where every item is tracked to the store. Too bad I can't remember much more.