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Students of presidential regimes claim that while the combination of plurality rule for presidential elections and concurrent electoral cycles favors bipartism, majority rule for electing presidents favors multipartism. I argue that a reverse causality also affects the relationship between party systems and electoral systems. Using a bargaining model of institutional change, I propose that while dominant and large parties are likely to choose plurality rule and concurrent elections, small parties are likely to choose majority rule. I also argue that military rulers and military-civilian coalitions tend to follow the logic of electoral choice of small parties. These hypotheses are supported by a statistical analysis of the determinants of electoral choice in 49 cases of constitutional change in Latin America. Mechanisms of choice are analyzed in several episodes of electoral reform, including a negative case that suggests explanations of electoral choice not covered by the model presented in this paper. [ABSTRACT FROM AUTHOR]

Since 2000, Mexican politics has changed in two important ways. First, the PRI's defeat in the 2000 elections has ended a 70-year long one-party system. Second, the president no longer holds a majority in either chamber of a bicameral congress. In what is likely to be a new era of divided government, constitutional engineers proposed a multitude of constitutional reforms to promote good governance under a separation of powers system. While some reforms attempt to decrease the likelihood of minority presidents, others aim at strengthening the constitutional powers of the president. This paper argues that a viable and desirable strategy of constitutional change should avoid these two extremes. Instead, reforms should generate incentives to promote inter-branch cooperation during divided government. This paper discusses the benefits of a partial reform consisting of two parts: 1) electoral rules that promote correspondence between the preferences of citizens and those of policy makers and 2) constitutional powers that encourage coordination between the president and the congress in the process of policy making and cabinet formation. [ABSTRACT FROM AUTHOR]