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Does Wal-Mart have uniformly low prices, or do they rise prices if they manage to kill the competition?

Once an item hits a certain price, I think it stays that price. However, I've heard that, in their grocery department, at least, they sometimes demand smaller packaging than what goes to other retail stores -- that way, the price looks cheaper on your box of cereal, but you're getting less, so the unit cost is the same, or maybe even higher than in other retail stores. Caveat Emptor.