Power indices suggest that adding new members to a voting body may affect the balance of power between the original members even if their number of votes and the decision rule remain constant. Some of the original members may actually gain, a phenomenon known as the paradox of new members. We...

Many important decisions are taken according to weighted majority rule. Power indices predict that enlargement of the voting body may affect the balance of power between the original members even if their number of votes and the decision rule remain constant. Some of the existing voters may...

We study a Condorcet jury model where voters are driven both by passion (expressive motives) and by reason (instrumental motives). We show that arbitrarily small amounts of passion significantly affect equilibrium behavior and the optimal size of voting bodies. Increasing the size of voting...

We study strategic voting in a Condorcet type model in which voters have identical preferences but differential information. Voters incur private costs of going to the polls and may abstain if they wish; hence voting is voluntary. We show that under majority rule with voluntary voting, it is an...