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Title: Multicandidate Elections: Aggregate Uncertainty in the Laboratory

Author(s): Laurent Bouton, Micael Castanheira and Aniol Llorente-Saguer

Publication Date: March 2015

Keyword(s): aggregate uncertainty, experiments, multicandidate elections, plurality and rational-voter model

Programme Area(s): Public Economics

Abstract: The rational-voter model is often criticized on the grounds that two of its central predictions (the paradox of voting and Duverger's law) are at odds with reality. Recent theoretical advances suggest that these empirically unsound predictions might be an artifact of an assumption in those models: the absence of aggregate uncertainty about the distribution of preferences in the electorate. In this paper, we propose the first direct empirical evidence of the effect of aggregate uncertainty in multicandidate elections. Adopting a theory-based experimental approach, we explore whether aggregate uncertainty indeed favors the emergence of non-Duverger's law equilibria in plurality elections. Our experimental results support the main theoretical predictions: sincere voting is a predominant strategy under aggregate uncertainty, whereas without aggregate uncertainty, voters massively coordinate their votes behind one candidate, who wins almost surely.

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Bibliographic Reference

Bouton, L, Castanheira, M and Llorente-Saguer, A. 2015. 'Multicandidate Elections: Aggregate Uncertainty in the Laboratory'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=10481