We analyze the problem of choosing the w contestants who will win a competition within a group of nw competitors when all jurors commonly observe who are the w best contestants but may be biased. We study conditions on the configuration of the jury so that it is possible to induce the jurors to...

A jury must provide a ranking of contestants (students applying for scholarships or Ph.D. programs, gymnasts in a competition, etc.). There exists a true ranking which is common knowledge among the jurors, but is not verifiable. The socially optimal rule is that the contestants be ranked...

We propose a multidimensional spatial model of political competition where the advertising campaign aims at influencing the weights that voters’ preferences assign to different political issues. The campaign strategies will move the vote of those voters who lack of partisan identification. The...

This paper studies Nash implementation when the outcomes of the mechanism can be renegotiated among the agents but the planner does not know the renegotiation function that they will use. We characterize the social objectives that can be implemented in Nash equilibrium when the same mechanism...

This paper studies the principal-multiagent model of a firm subject to adverse selection. We focus on agents who have complete information. We propose some desirable properties to be satisfied by mechanisms implementing the first-best in Nash equilibrium: (i) enforceability (a property related...

We consider the problem of allocating m commodities among n agents with single-peaked preferences. When m\geq2 and n=2 any strategy-proof and efficient solution is dictatorial. We propose an extension of the Uniform Rule that (in the two-agents case) is the only one that satisfies...