We generalize the canonical problem of Nash implementation by allowing agents to voluntarily provide discriminatory signals, i.e. evidence. Evidence can either take the form of hard information or, more generally, have differential but non-prohibitive costs in different states. In such...

This paper considers Bayesian and Nash implementation in exchange economic environments with state dependent preferences and feasible sets. We fully characterize Bayesian implementability for both diffuse and non-diffuse information structures. We show that, in exchange economic environments...

Two experts make yes/no predictions about whether an event, such as an economic crisis, will occur. They receive private signals about the likelihood of the event that are much more informative than the coarse recommendations they can ultimately convey. The experts may care about both absolute...

A collective action or revolt succeeds only if sufficiently many people participate. We study how potential revolutionaries' ability to coordinate is affected by what they learn from different sources. We first examine how people learn about the likelihood of a revolution's success by talking to...

Electoral legislation varies across countries and within countries over time, and across different types of elections in terms of how it allows publication of intermediate election results including turnout and candidates' vote shares during an election day. Using a pivotal costly voting model...

We show theoretical and experimental results that demonstrate the potential of transparency to influence committee decision making and deliberation. We present a model in which committee members have career concerns and unanimity is needed to change the status quo. We study three scenarios -...

Informed voters are believed to be necessary for the well-functioning of elections. However, the puzzle is raised: Why are voters and politicians becoming more polarized despite the increased availability of information? We consider an election with policy-motivated candidates and partially...

We investigate experimentally the effects of corrupt experts on information aggregation in committees. We find that non-experts are significantly less likely to delegate through abstention when there is a probability that experts are corrupt. Such decreased abstention when the probability of...

We examine the value of public information when a society uses a social choice rule to decide among a set of outcomes. We require that a social choice function satisfies unrestricted domain, non-decisiveness and the Pareto principle. We show that there exist payoff structures for every social...

In this paper we present a model of implementation based on the idea that agents renegotiate unfeasible allocations. We characterize the maximal set of Social Choice Correspondences that can be implemented in Nash Equilibrium with a class of renegotiation functions that do not reward agents for...