We develop and calibrate a comprehensive model of the world and the calibrators calibrating it. The model is general in the sense that it takes into account not only the relevant, but also the irrelevant features of the economic environment. One of the byproducts of the analysis is the World...

We consider a dynamic oligopoly model in which a seller may drop out of the market when demand for its product is insufficient in the first period. Buyers suffer some disutility if a seller exits the market and so their first period purchase decision does not only depend on current period...

We analyze a model in which agents have to make a binary choice under incomplete information about the state of the world, but also care about coordination with other agents who have the same problem. In some of these situations, the larger the share choosing the same alternative, the better off...

This paper analyzes a model in which two groups compete with each other for a prize in every time period. We assume that there is a status quo bias: Yesterday's winner is in a stronger position than the other group, if there is a fight today. Hence, a change of the status quo has long term...

Candidates for U.S. presidential elections are determined through sequential elections in single states, the primaries. We develop a model in which candidates can influence their winning probability in electoral districts by spending money on campaigning. The equilibrium replicates several...

In many important political problems, citizens can directly participate in the political decision making through a referendum. These settings are often characterized by uncertainty over the future consequences of the decision, the possibility of learning about these over time, and the...

We consider a society that has to elect an official who provides a public service for the citizens. Potential candidates differ in their competence and every potential candidate has private information about his opportunity cost to perform the task of the elected official. We develop a new...

Civilian targets of terrorist or criminal attacks (e.g., sport stadiums, chemical or nuclear industry; infrastructure such as ports or pipelines) are often owned by the private agents who choose how to guard against potential attacks. This creates an important externality problem, as some of the...

When candidates in primary elections are ideologically differentiated (e.g., conservatives and moderates in the Republican party), then candidates with similar positions affect each others' vote shares more strongly than candidates with different ideological positions. We measure this effect in...