(a question posed by Kimberly)
Most goods that come in different sizes have different prices assigned to each size (drinks, boxes of cereal, etc.); most likely in part due to the increased cost of making more of a good. However, this does not apply to clothes or shoes, where the price is the same no matter which size you buy (even though it surely costs more in raw materials to produce the larger sizes).
The question is: Why don't stores charge different prices for different sizes of clothes or shoes? Particularly, why don't they charge more for the larger sizes?