Full Information Equivalence in Large Elections
40 Pages Posted: 6 Jun 2018 Last revised: 30 Jun 2020
Date Written: February 4, 2019
We study the problem of aggregating private information in elections with two or more alternatives. We characterize environments where information can be aggregated asymptotically by a sequence of equilibria of voting games as the electorate grows large and explore the implications for the information structure. Information aggregation is generically possible when the signal space is rich relative to the state space, and fails robustly when the state space is rich relative to the signal space. We focus on plurality rule, but our results extend to supermajority rules and a large family of scoring rules which includes the approval rule.
Keywords: Information Aggregation, Large Elections
JEL Classification: C71, D72, D80
Suggested Citation: Suggested Citation