type="main" <p>We consider a class of contracts in which buyers commit to giving a seller some minimum share of their total purchases. We show that such contracts can be used by an incumbent seller to reduce the probability of entry by a rival seller when the incumbent can commit to its selling...</p>

This paper analyzes competitive pricing policies by multiproduct firms facing heterogeneous buying patterns. We show that cross-subsidization arises when firms have comparative advantages on different products but are equally efficient overall: Firms earn a profit from multi-stop shoppers by...

We show that large retailers, competing with smaller stores that carry a narrower range, can exercise market power by pricing below cost some of the products also offered by the smaller rivals, in order to discriminate multistop shoppers from one-stop shoppers. Loss leading thus appears as an...

This paper proposes a new approach of fighting collusion in tournaments which sheds light on the principle of divide and conquer: the principal can benefit from manipulating information revelation, by which he brings asymmetric information between the agents and thus creates a distortion of...

This paper brings a new point of view into the theory of collusion-proof mechanism design, which highlights the principle of divide and conquer. We relax the restriction of publicly enforced grand contract in the framework of Laffont-Martimort-Itoh, which allows us to incorporate the approach of...

Leniency programs contribute to destabilizing collusion but can also be abused and generate perverse effects. This paper develops a simple model capturing this trade-off, which we use to relate the optimal leniency policy (the carrot) to the effectiveness of investigations (the stick). We show...

This paper analyzes competitive pricing policies by multiproduct firms facing heterogeneous buying patterns. We show that cross-subsidization arises when firms have comparative advantages on different products but are equally efficient overall: Firms earn a profit from multi-stop shoppers by...

Tournaments are well known to be vulnerable to collusion as shown by the impossibility theorem in Ishiguro (2004), which asserts that efficient effort levels are impossible to be implemented through a collusion-proof contract. However, we argue that this impossibility is a product of simple...

Many low-price guarantees are offered by small local firms who compete against much larger rivals. The prices of these larger rivals are often set nationally and thus are independent of local market conditions. Our objective in this paper is to explain why small firms in such environments might...