Condorcet's paradox is one of the most prominent results in social choice theory. It says that there may not exist any alternative that a net majority prefers over every other alternative. When outcomes need not be deterministic alternatives, we show that a similar paradox still exists even if...

Many local public goods are provided in coalitions. When coalitions form they may have the power to exclude members. The core applies to such cases. When coalitions cannot exclude members, all who prefer the provided public good can join. The no-exodus equilibrium is proposed for such cases. It...

The Swing Voter's Curse is extended to incorporate a class of supermajority rules.

The spatial voting approach is extended to account for the existence of a loyalty effect driving the choice of parties' platforms during elections. There emerges a non-linear relationship between these variable, whereby a party sticking to its historical heritage may lose to a rival more keen to...

I discuss a scenario in which second expert opinions may not benefit decision making. The introduction of a second expert s the possibility of partisan bickering, which impairs information transmission.

This paper proves the existence of non-empty cores for directed network problems with quotas and for those combinatorial allocation problems which permit only exclusive allocations.

This paper investigates a generalized Baron-Ferejohn model with different discount factors, different recognition probabilities and q-majority rule. In the paper, it is shown that if players are sufficiently patient, recognition probabilities are similar and the voting rule is not unanimous,...

This note shows that in an incomplete information situation the closure condition will be satisfied by all social choice sets if and only if the set of states of the society which all agents believeoccur with positive probability satisfies the `connection' condition.It then follows from...

This paper offers a solution to King Solomon's problem of allocating an indivisible "prize" to two agents. We add time dimension to the original space of outcomes and construct a static mechanism similar to the one used in virtual implementation. The implementation is imminent: the mechanism...

We analyze simple coalition formation problems in which a group of agents is partitioned into coalitions and agents' preferences only depend on the identity of the members of the coalition to which they belong. We study coaltion formation rules that associate to each profile of agents''...