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Electoral rules have fascinated politicians and political scientists for decades, because they ar... more Electoral rules have fascinated politicians and political scientists for decades, because they are commonly assumed to condition the chances of success of competing parties or candidates. This chapter covers one important set of electoral rules, namely the electoral system, which defines how votes are cast and seats allocated. Other sets of rules, such as those concerning the use of referenda, the control of election spending, and the regulation of political broadcasting, are dealt with in other chapters. We first document the great diversity of electoral systems presently existing among democracies. This raises the question of whether electoral systems matter, of what concrete impact they have on political life. The second section thus examines the political consequences of electoral laws. Once these consequences are known, we are in a position to tackle the crucial normative question of which is the best electoral system. The third section of the chapter reviews the debate and identifies the major tradeoffs involved in the choice of an electoral system. D i v e r s i t y o f e l e c t o r a l s y s t e m s Even scholars specialized in the field are amazed by the diversity and complexity of contemporary electoral systems. The rules that govern how votes are cast and seats allocated differ markedly from one country to another. Selecting an electoral system is not a purely technical decision. It may have huge consequences for the operation of the political system. As discussed in the following section of the chapter, applying two different formulas to the same distribution of votes will produce quite different outcomes in terms of members elected for each party. To give a concrete example, let us look at the critical British election of 1983, the first election in a major nation where voters were passing judgment 2
Electoral rules have fascinated politicians and political scientists for decades, because they ar... more Electoral rules have fascinated politicians and political scientists for decades, because they are commonly assumed to condition the chances of success of competing parties or candidates. This chapter covers one important set of electoral rules, namely the electoral system, which defines how votes are cast and seats allocated. Other sets of rules, such as those concerning the use of referenda, the control of election spending, and the regulation of political broadcasting, are dealt with in other chapters. We first document the great diversity of electoral systems presently existing among democracies. This raises the question of whether electoral systems matter, of what concrete impact they have on political life. The second section thus examines the political consequences of electoral laws. Once these consequences are known, we are in a position to tackle the crucial normative question of which is the best electoral system. The third section of the chapter reviews the debate and identifies the major tradeoffs involved in the choice of an electoral system. D i v e r s i t y o f e l e c t o r a l s y s t e m s Even scholars specialized in the field are amazed by the diversity and complexity of contemporary electoral systems. The rules that govern how votes are cast and seats allocated differ markedly from one country to another. Selecting an electoral system is not a purely technical decision. It may have huge consequences for the operation of the political system. As discussed in the following section of the chapter, applying two different formulas to the same distribution of votes will produce quite different outcomes in terms of members elected for each party. To give a concrete example, let us look at the critical British election of 1983, the first election in a major nation where voters were passing judgment 2