Supermajority politics: Equilibrium range, policy diversity, utilitarian welfare, and political compromise

Aseem Mahajan, Roland Pongou and Jean-Baptiste Tondji

European Journal of Operational Research, 2023, vol. 307, issue 2, 963-974

Abstract: The standard Bowen model of political competition with single-peaked preferences (Bowen, 1943) predicts party convergence to the median voter’s ideal policy, with the number of equilibrium policies not exceeding two. This result assumes majority rule and a unidimensional policy space. We extend this model to static and dynamic political economies where the voting rule is a supermajority rule, and the policy space is totally ordered. We show that the exact number of equilibria in these settings is an increasing correspondence of the supermajority’s size. Our findings have implications for the depth of policy diversity across structurally identical supermajoritarian political economies. We also examine the equilibrium effects of supermajority rules on utilitarian welfare and political compromise under uncertainty.

Keywords: Supermajority rules; Number of equilibria; Utilitarian welfare; Diversity and compromise; Uncertainty (search for similar items in EconPapers)
JEL-codes: C71 D72 P16 (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:ejores:v:307:y:2023:i:2:p:963-974

DOI: 10.1016/j.ejor.2022.10.018

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