FEEM working papers "Note di lavoro" series
2017 .005

The Swing Voter's Curse in Social Networks


Authors: Berno Buechel, Lydia Mechtenberg
Series: Economic Theory
Editor: Carlo Carraro
Keywords: Strategic Voting, Social Networks, Information Aggregation
JEL n.: D72, D83, D85, C91

Abstract

We study private communication in social networks prior to a majority vote on two alternative policies. Some (or all) agents receive a private imperfect signal about which policy is correct. They can, but need not, recommend a policy to their neighbors in the social network prior to the vote. We show theoretically and empirically that communication can undermine efficiency of the vote and hence reduce welfare in a common interest setting. Both efficiency and existence of fully informative equilibria in which vote recommendations are always truthfully given and followed hinge on the structure of the communication network. If some voters have distinctly larger audiences than others, their neighbors should not follow their vote recommendation; however, they may do so in equilibrium. We test the model in a lab experiment and strong support for the comparative-statics and, more generally, for the importance of the network structure for voting behavior.

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Suggested citation: Buechel, B., L. Mechtenberg, (2017), 'The Swing Voter's Curse in Social Networks', Nota di Lavoro 5.2017, Milan, Italy: Fondazione Eni Enrico Mattei

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