Application Costs in Sequential Admission Mechanisms

This paper considers a realistic family of admission mechanisms, with multiple applications and application costs. Multiple applications impose serious coordination problems to colleges, but application costs restore stability. Without application costs and under incomplete information unstable allocations emerge.Application Costs; Matching Markets; Implementation.

Costly information acquisition. Part I: better to toss a coin?

In a common-values election with two candidates voters receive a signal about which candidate is superior. They can acquire information that improves the precision of the signal. Electors differ in their information acquisition costs. For large electorates a non negligible fraction of voters acquires information, but the quantity of informed voters and the quality of acquired information decline so fast that information aggregation fails to obtain.Costly Information Acquisition, Condorcet Jury Theorem.

Reliability and Responsibility: A Theory of Endogenous Commitment

A common assumption in Political Science literature is policy commitment: candidates maintain their electoral promises. We drop such assumption and we show that costless electoral campaign can be an effective way of transmitting information to voters. The result is robust to relevant equilibrium refinements. An unavoidable proportion of ambiguous politicians emerges.Information Transmission, Electoral Campaign, Endogenous Commitment.

Games of capacities : a (close) look to Nash Equilibria

The paper studies two games of capacity manipulation in hospital-intern markets. The focus is on the stability of Nash equilibrium outcomes. We provide minimal necessary and sufficient conditions guaranteeing the existence of pure strategy Nash Equilibria and the stability of outcomes

Games of Capacities: A (Close) Look to Nash Equilibria

The paper studies two games of capacity manipulation in hospital-intern markets. The focus is on the stability of Nash equilibrium outcomes. We provide minimal necessary and sufficient conditions guaranteeing the existence of pure strategy Nash Equilibria and the stability of outcomes.Stable Matchings, Capacity, Nash Equilibrium, Cycles.

Games with capacity manipulation : incentives and Nash equilibria

Studying the interaction between preference and capacity manipulation in matching markets, we prove that acyclicity is a necessary and sufficient condition that guarantees the stability of a Nash equilibrium and the strategy-proofness of truthful capacity revelation under the hospital-optimal and intern-optimal stable rules. We then introduce generalized capacity manipulations games where hospitals move first and state their capacities, and interns are subsequently assigned to hospitals using a sequential mechanism. In this setting, we first consider stable revelation mechanisms and introduce conditions guaranteeing the stability of the outcome. Next, we prove that every stable non-revelation mechanism leads to unstable allocations, unless restrictions on the preferences of the agents are introducedStable matching, Capacity, Nash equilibrium, Cycles

Acyclicity and singleton cores in matching markets

This paper analyzes the role of acyclicity in singleton cores. We show that the absence of simultaneous cycles is a sufficient condition for the existence of singleton cores. Furthermore, acyclicity in the preferences of either side of the market is a minimal condition that guarantees the existence of singleton cores. If firms or workers preferences are acyclical, unique stable matching is obtained through a procedure that resembles a serial dictatorship. Thus, acyclicity generalizes the notion of common preferences. It follows that if the firms or workers preferences are acyclical, unique stable matching is strongly efficient for the other side of the marketStable matching, Acyclicity, Singleton cores

Ramón y Cajal: Mediation and Meritocracy

The Ramón y Cajal Program promotes the hiring of top researchers in Spanish R&D centers and academic institutions. The centralized mechanism associated to the Program is analyzed. The paper models it as a two-sided matching market and studies if it provides the incentives to increase the quality of the researchers hired. We analyze the mechanism both under complete and incomplete information. The comparison of the theoretical findings with the available data points out that the mechanism provides poor incentives and does not prevent collusion between research departments and candidates in the hiring process.Matching Markets; Preagreements; Implementation.

Implementation with renegotiation when preferences and feasible sets are state dependent.

In this paper, we present a model of implementation where infeasible allocations are converted into feasible ones through a process of renegotiation that is represented by a reversion function. We describe the maximal set of Social Choice Correspondences that can be implemented in Nash Equilibrium in a class of reversion functions that punish agents for infeasibilities. This is used to study the implementation of the Walrasian Correspondence and several axiomatic solutions to problems of bargaining and taxation.Teoría de juegos; Toma de decisiones; Economía del bienestar;

Reliability and Responsibility: A Theory of Endogenous Commitment

A common assumption in Political Science literature is policy commitment: candidates maintain their electoral promises. We drop such assumption and we show that costless electoral campaign can be an effective way of transmitting information to voters. The result is robust to relevant equilibrium refinements. An unavoidable proportion of ambiguous politicians emerges, consistently with empirical findings