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Voting Behavior and Information Aggregation in Elections With Private Information

Timothy Feddersen and Wolfgang Pesendorfer
Econometrica
Vol. 65, No. 5 (Sep., 1997), pp. 1029-1058
Published by: The Econometric Society
DOI: 10.2307/2171878
Stable URL: http://www.jstor.org/stable/2171878
Page Count: 30
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Voting Behavior and Information Aggregation in Elections With Private Information
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Abstract

We analyze two-candidate elections in which voters are uncertain about the realization of a state variable that affects the utility of all voters. Each voter has noisy private information about the state variable. We show that the fraction of voters whose vote depends on their private information goes to zero as the size of the electorate goes to infinity. Nevertheless, elections fully aggregate information in the sense that the chosen candidate would not change if all private information were common knowledge. Equilibrium voting behavior is to a large extent determined by the electoral rule, i.e., if a candidate is required to get at least x percent of the vote in order to win the election, then in equilibrium this candidate gets very close to x percent of the vote with probability close to one. Finally, if the distribution from which preferences are drawn is uncertain, then elections will generally not satisfy full information equivalence and the fraction of voters who take informative action does not converge to zero.

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