Efficient collusion in optimal auctions

We study collusion in an IPV auction with binary type spaces. Collusion is organized by a third-party than can manipulate participation decisions. We characterize the optimal response of the seller to different threats of collusion among the bidders. We show that, contrary to the prevailing view that assymmetric information imposes transaction costs in side-contracting, collusion in the optimal auction is efficient when the third-party can implement monetary transfers as well as when it can implement monetary transfers and reallocations of the good. The threat of non-participation in the auction by a subset of bidders is crucial in constraining the seller's profit.COLLUSION; THIRD PARTY; OPTIMAL AUCTION

Ratification and veto constraints in mechanism design

The note points out some restrictions imposed by the notion of ratification. This notion is widely used in the mechanism design literature that assumes that each agent has a veto power. We exhibit allocations that are note ratifiable and nevertheless can be implemented through a mechanism that gives veto power to the agents.MECHANISM DESIGN; PARTICIPATION CONSTRAINTS; RATIFIABILITY; VETO

International Migration, Imperfect Information, and Brain Drain

We consider a model of international migration where skills of workers are imperfectly observed by firms in the host country and where information asymmetries are more severe for immigrants than for natives. There are two stages. In the first one, workers in the South decide whether to move and pay the migration costs. These costs are assumed to be sunk. In the second stage, firms offer wages to the immigrant and native workers who are in the country. Because of imperfect information, firms statistically discriminate high-skilled migrants by paying them at their expected productivity. The decision of whether to migrate or not depends on the proportion of high-skilled workers among the migrants. The migration game exhibits strategic complementarities, which, because of standard coordination problems, lead to multiple equilibria. We characterize them and examine how international migration affects the income of individuals in sending and receiving countries, and of migrants themselves. We also analyze under which conditions there is positive or negative self-selection of migrants.asymmetric information, screening, self-selection of migrants, skill-biased migration, wage differentials

International Migration, Imperfect Information and Brain Drain

We consider a model of international migration where skills of workers are imperfectly observed by firms in the host country and where information asymmetries are more severe for immigrants than for natives. There are two stages. In the first one, workers in the South decide whether to move and pay the migration costs. These costs are assumed to be sunk. In the second stage, firms offer wages to the immigrant and native workers who are in the country. Because of imperfect information, firms statistically dicriminate high-skilled migrants by paying them at their expected productivity. The decision of whether to migrate or not depends on the proportion of high-skilled workers among the migrants. The migration game exhibits strategic complementarities, which, because of standard coordination problems, lead to multiple equilibria. We characterize them and examine how international migration affects the income of individuals in sending and receiving countries, and of migrants themselves. We also analyze under which conditions there is positive or negative self-selection of migrants.asymmetric information, screening, self-selection of migrants, skill-biased migration, wage differentials

Mechanism design with private communication

We investigate the consequences of assuming "private" communication between the principal and each of his agents in an otherwise standard mechanism design setting.Doing so simplifies significantly optimal mechanisms and institutions. Moreover, it restores continuity of the principal's payoff and of the optimal mechanism with respect to the information structure while still maintaining the useful role of correlation to better extract the agents' information rent. We first prove a "Revelation Principle with private communication" that characterizes the set of allocations implementable under private communication by means of simple "non-manipulability constraints". We also demonstrate a "Taxation Principle" which helps drawing some links between private communication and limited commitment on the principal's side. Equipped with those tools, we derive optimal non-manipulable mechanisms in various environments (unrelated projects, auctions, team production).MECHANISM DESIGN;PRIVATE COMMUNICATION

Patent pools and the dynamic incentives to R&D

Patent pools are cooperative agreements between several patent owners to bundle the sale fo their respective licences. In this paper the authors analyse their consequences on the speed of the sale of their respective licences. In this papier, they analyze their consequences on the speed of the innovation process. They adopt an ex ante prespective and study the impact of possible pool formation on the incentives to innovate. Because participation in the creation of a pool acts as a bonus reward on R&D activity, they show that a firm's investment pattern is upward sloping over time before pool formation, and decreases afterwards. The smaller the set of initial contributors, the higher this effect. A pool formation mechanism based on a proposal by the industry and acceptant / refusal by the competition authority may induce overinvestment in early innovations and lead to a delayed clearance date, that is suboptimal from an ex ante viewpoint.LICENSING; R&D RACES; INNOVATION; COMPETITIION POLICY

International Migration, Imperfect Information and Brain Drain

We consider a model of international migration where skills of workers are imperfectly observed by firms in the host country and where information asymmetries are more severe for immigrants than for natives. There are two stages. In the first one, workers in the South decide whether to move and pay the migration costs. These costs are assumed to be sunk. In the second stage, firms offer wages to the immigrant and native workers who are in the country. Because of imperfect information, firms statistically discriminate high-skilled migrants by paying them at their expected productivity. The decision of whether to migrate or not depends on the proportion of high-skilled workers among the migrants. The migration game exhibits strategic complementarities, which, because of standard coordination problems, lead to multiple equilibria. We characterize them and examine how international migration affects the income of individuals in sending and receiving countries, and of migrants themselves. We also analyze under which conditions there is positive or negative self-selection of migrants.asymmetric information, screening, self-selection of migrants, skill-biased migration, wage differentials

Mutual Supervision in Preshipment Inspection Programs

Preshipment inspection programs are implemented in many developing countries to fight customs corruption. They consist in delegating the inspection of imports to a private firm that operates in the exporting country. To study those PSI programs, we develop a hierarchical agency model where the government authority can rely on two supervisors, namely the private inspection firm and the customs administration, to control importers' declarations. The government's optimal program is fully characterized. We devote some attention to the optimal inspection policy and its comparative statics properties. In particular, we identify the situations in which PSI programs are optimal. Our results highlight the fact that implementing PSI programs both to fight corruption and to modernize customs is inconsistent. We also discuss the optimal reconciliation policy, i.e. what to do in case of conflicting inspection reports by the private firm and the customs administration. In the optimal mechanism, mutual supervision between the private firm and the customs administration is used to provide adequate incentives to all parties.Preshipment inspection;Mutual supervision;corruption;Customs administration.