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As far as I know this is to do with setting appropriate prices across a range - so for coke...small can. Can, small bottle, large bottle, giant bottle - prices need to be in order so as not to discourage purchases of the most profitable sizes...i.e maximise profits across the range not just a particular package size. This can also be interpreted as a range of products i.e coca-cola sells sprite, orange juice, diet coke etc. -