From tv specials I've seen on Wal-mart (Frontline, various Disscovery/Times Channel and History Channel specials) and what I've read, (various magazine articles, a few bits in books) Wal-Mart make a profit on almost everything. Even their warehouse store (Sam's Club) due to the HUGE volume they buy in, their advanced ordering system (no wasted product), and their bullying tactics when it comes to negotiating prices with new product vendors.
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