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Proportional Representation

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  • Roger B. Myerson

Abstract

This paper considers basic constitutional questions about how to elect a legislature. Electoral systems that require blocks of voters to coordinate their votes create a need for pre-election leadership and raise barriers to entry against new parties. Such barriers to entry can rigidity the political systems and decrease the incentives for established political leaders to serve the public honestly and effectively. So we consider an axiom of coalitional straightforwardness, which asserts that an electoral system should minimize the need for pre-election coordination of voters who share simple dichotomous preferences. Axioms of nondivisiveness, neutrality of party labels, responsiveness, and homogeneity (or coalitional autonomy) are also formulated. It is shown that only two kinds of electoral systems satisfy these axioms: winner-take-all approval-voting systems (AV), and single-divisible vote-proportional-representation systems (PR). Thus, AV and PR are seen to be uniquely compatible in terms of the incentives for party structure that they create, although AV and PR may differ in their incentives for party positioning in issue space. Possible use of AV and PR together in a bicameral legislature is discussed.

Suggested Citation

  • Roger B. Myerson, 1991. "Proportional Representation," Discussion Papers 928, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
    • Handle: RePEc:nwu:cmsems:928
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    8. Gibbard, Allan, 1973. "Manipulation of Voting Schemes: A General Result," Econometrica, Econometric Society, vol. 41(4), pages 587-601, July.
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