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Vickers (2001) have shown that if the consumers are required to buy all the goods at one
shop (a practice usually referred to as \pure bundling") the competition can be modeled
in terms of utility oers made by retailers and thus solved relatively easily. The aim of
this study is distinctly dierent: we want to analyze pricing strategies of multiproduct
retailers when, at least some, consumers are able to buy products at dierent shops.
This phenomena seems to be widespread (e.g.