Suppose that the goals of a society can be summarized in a social choice rule, i.e., a mapping from relevant underlying parameters to final outcomes. Typically, the underlying parameters (e.g., individual preferences) are private information to the agents in society. The implementation problem...

Many collective decision problems have the common feature that individuals' desired outcomes are correlated but not identical. This paper studies collective decisions with private information about these desired policies. Each agent holds private information which mainly concerns his own bliss...

We consider a two-candidate campaign competition in majoritarian systems with many voters. Some voters are loyal, some can be influenced by campaign spending. Own loyalty with respect to a candidate is the voter's private information. Candidates simultaneously choose their campaign budgets and...

We develop a dynamic model in which a group collectively bargains with an external party. At each date the group makes an offer to the external party (the 'agent') in exchange for a concession. Group members hold heterogeneous preferences over agreements and are uncertain about the agent's...

The paper considers public funding of political parties when some voters are poorly informed about parties? candidates and campaigns are informative. For symmetric equilibria, it is shown that more public funding leads parties to chose more moderate candidates, and that an increase in the...

We develop a dynamic model in which a group collectively bargains with an external party. At each date the group makes an offer to the external party (the 'agent') in exchange for a concession. Group members hold heterogeneous preferences over agreements and are uncertain about the agent's...

We study political activism by several agents (lobbyists, unions, etc.) who have private but imperfect policy-relevant signals, and seek to influence the decisions of a policy maker. When agents can share information and coordinate their actions, the equilibrium is shown to be equivalent to that...

Politicians frequently undertake projects whose budgetary costs are disproportionate to the benefits they create for the voters or shareholders those decision-makers represent. When they are not the result of simple random mistakes, such wasteful projects are often attributed to weak mechanisms...