A group of agents has to decide whether to accept or reject a proposal. Agents vote in favor or against the proposal and, if the number of agents in favor is greater than certain quota, the proposal is accepted. The socially optimal decision is the one adopted when all agents vote truthfully....

We induce conformity in a binary-decision voting game by assuming that agents may derive some utility by voting the same option that others. Theoretically, we show that truthful voting is the unique equilibrium without conformity. Introducing conformity enlarges the set of equilibria, which...