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Kati Suominen Inter-American Development Bank Proportional representation systems affect the extent to which elected legislators exhibit various attributes that allow them to earn a personal vote. The sources of variation in personal vote-earning attributes (PVEA) lie in informational shortcuts voters use under different electoral rules. List type (closed or open) and district magnitude (the number of legislators elected from a district) affect the types of shortcuts voters employ. When lists are closed, legislators' PVEA are of decreasing usefulness to voters as magnitude (and hence the number of candidates on a list) increases. When lists are open, legislators' PVEA are increasingly useful to voters as magnitude increases, because the number of candidates from which voters must choose whom to give a preference vote increases. As predicted by the theory, the probability that a legislator will exhibit PVEAoperationalized as local birthplace or lower-level electoral experience-declines with magnitude when lists are closed, but rises with magnitude when lists are open.

In recent years renewed attention has been directed to the importance of the role of institutional design in democratic politics. Particular interest has concerned constitutional design and the relative merits of parliamentary versus presidential systems. In this book, the authors systematically assess the strengths and weaknesses of various forms of presidential systems, drawing on recent developments in the theoretical literature about institutional design and electoral rules. They develop a typology of democratic regimes structured around the separation of powers principle, including two hybrid forms, the premier-presidential and president-parliamentary systems, and they evaluate a number of alternative ways of balancing powers between the branches within these basic frameworks. They also demonstrate that electoral rules are critically important in determining how political authority is exercised.

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Presidents often lack legislative majorities, but situations of opposition-party majorities (“divided government”) are much less common outside the United States. The president's party's share of seats tends to increase in early-term elections but decline in later elections. Thus opposition majorities often result after midterm elections. Opposition majorities rarely occur in elections held concurrently with the presidential election but are more likely to do so if legislators enjoy electoral independence from their parties due to features of electoral laws.

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