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Ulric B. and Evelyn L. Bray Social Sciences Seminar

Tuesday, May 1, 2018
4:00pm to 5:00pm
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Baxter B125
The Swing Voter's Curse in Social Networks
Lydia Mechtenberg, Professor of Economics, University of Hamburg; Visiting Associate in Economics, Caltech,

Abstract: We study private communication in social networks prior to 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 recommendation; however, they may do so in equilibrium. We test the model in a lab experiment and find strong support for the comparative-statics and, more generally, for the importance of the network structure for the voting behavior.

For more information, please contact Letty Diaz by phone at 626-395-1255 or by email at [email protected] or visit the full paper, "The Swing Voter's Curse in Social Networks," here..