Costly voting in weighted committees: The case of moral costs

We develop a theoretical model of voting behavior in committees when members differ in influence and receive payoffs that condition on the individual vote and the collective decision. Applied to a group decision involving moral costs, the model predicts that the distribution of decision-making power affects committee members’ incentives to make immoral choices: More influential agents tend to support the immoral choice, while less influential agents free-ride. A skewed power distribution makes immoral collective choices more likely. We then present results of a laboratory experiment that studies committee members’ voting behavior and collective choices under different distributions of decision-making power. As hypothesized, we find that the frequency of immoral decisions is positively related to an agent’s voting power.