Using a laboratory experiment, we study the incentives of individuals to contribute to a public good that is provided if and only if the fraction of contributors reaches a certain threshold. We jointly vary the size of the group, the cost of contributing, the required threshold, and the framing...

Using a laboratory experiment, we study the incentives of individuals to contribute to a public good that is provided if and only if the fraction of contributors reaches a certain threshold. We jointly vary the size of the group, the cost of contributing, the required threshold, and the framing...

We study the implications of participation in political collective action on identity and on interpersonal interactions using a laboratory experiment. We offer subjects the possibility to sign an online petition, which was either related to animal rights or the right to bear firearms. Before and...

A committee divided into two factions is considering a costly project. Support of both factions is required for the project to be approved. As long as the decision is delayed, the committee can learn which faction benefits from the project. At the equilibrium, one of the factions effectively...

Political agents often attempt to influence elections through "troll farms" that flood social media platforms with messages from fake accounts that emulate genuine information. We study the ability of troll farms to manipulate elections. We show that such disinformation tactics is more effective...

How do voting institutions affect incentives of committees to vote expressively? We model the problem of a committee, whose members have different depths of reasoning, that decides whether to approve an ethical proposal. Members who vote for the proposal receive expressive utility, but all...

A continuum of contestants are choosing whether to enter a competition. Each contestant has a type, and of those who enter, the ones with highest types receive prizes. A profit-maximising firm controls entry, and charges a price for it. I analyse how the mass and value of prizes determine...