We study vertical contracting through bargaining between an upstream supplier and downstream retailers. We consider the effect of supplier uncertainty as to final volumes on the efficient bargains struck. Uncertainty causes retail price effects: large buyers wield countervailing power (deliver...

In many competitive settings consumers buy multiple product categories, and some prefer to use a single firm, generating complementary cross-category price effects. To study pricing in supermarkets, an organizational form where these effects are internalized, we develop a multi-category...

The UK supermarket industry has a high profile because of its large share of household budgets. In 2003 the UK competition authorities blocked all potential mergers between the top-three firms and the fourth. After this, there was an apparent consensus that mergers between the largest four...