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Mixed-Member Electoral SystemsThe Best of Both Worlds?$
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Matthew Soberg Shugart and Martin P. Wattenberg

Print publication date: 2003

Print ISBN-13: 9780199257683

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/019925768X.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 18 September 2021

Reforming Electoral Systems in Mexico

Reforming Electoral Systems in Mexico

(p.209) 10 Reforming Electoral Systems in Mexico
Mixed-Member Electoral Systems

Juan Molinar Horcasitas

Jeffrey A. Weldon

Oxford University Press

Mexico has a long experience with highly majoritarian variants of mixed‐member systems, but has recently been made more proportional in a process of democratization. Electoral reform has developed along two major axes: the degree of proportionality, and the composition of the electoral authority, with the parties often trading openness on one axis for closure on the other. Sometimes trade‐offs in reform negotiations followed a third dimension—the registration requirements for new parties. This chapter first describes the evolution of the Mexican electoral formulae from 1963 to today, explaining the rationale of each phase of reform either as a majority party decision or as a trade‐off between government and opposition; the phases described are the plurality party deputy system (1963–1976), the mixed‐member majoritarian (MMM) minority representation system (1979–1985), the governability clause of the 1988 law, the governability clause with ‘moving escalator’ of the 1991 law, and the abandonment of the governability clause in the 1994 law. The last part of the chapter focuses on the last round of electoral reforms (the 1997 law), in which the mixed‐member majoritarian (MMM) system reintroduced in 1994 (after the earlier brief interludes of systems that combined MMM with mixed‐member proportional (MMP) arrangements under the 1988 and 1991 laws), was further reformed to result in a more proportional allocation of seats, with the dominant principle depending on the vote distribution.

Keywords:   electoral authority, electoral history, electoral reform, electoral systems, government, majoritarian mixed‐member systems, Mexico, minority representation systems, mixed‐member electoral systems, mixed‐member majoritarian minority representation systems, mixed‐member majoritarian systems, mixed‐member proportional systems, new parties, opposition, plurality system, proportional representation, registration requirements for new parties, representation systems, vote distribution

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