Namely, it was shown that if the two goods are complements retailers are able to discriminate between the more informed consumers (the shoppers) and the less informed ones (the captives) by enticing the former with one of the goods on a deep discount while taxing the latter by keeping the overall price tag high. This practice requires that the retailers are able to charge di erent combinations of prices that have a xed sum and yet induce consumers to buy both goods. Through this discrimination the retailers are able to improve their protability relative to selling the two goods as a bundle. It turns out that even when.
