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The binomial system is a voting system that was used in the parliamentary elections of Chile between 1989 and 2013. From a voting system point of view, it is a multiple-winner method of proportional representation with open lists, where winning candidates are chosen through the D'Hondt method. Its particularity comes from the fact that only two candidates are elected in each district, resulting in an over-representation of the second majority list. Its use was prescribed in the respective constitutional organic law during the Pinochet regime. The binomial system was invented in Poland in the 1980s under the Wojciech Jaruzelski regime, in order to foster political stability in the democratization process, maintaining the preeminence of the Polish United Workers' Party against the rise of the opposition movement ''Solidarność'', being recognized as a system that promoted consensus and negotiation between opposing sides of government.〔Maira, Luis (2001). «(El amarre institucional del General Pinochet y las restricciones de la transición chilena )». En Labastida, Julio; Camou, Antonio. ''Globalización, identidad y democracia: México y América Latina'' (I edición). México: Siglo Veintiuno Editores. p. 94. ISBN 968-23-2300-2.〕 The binomial system was considered by most analysts as the main constitutional lock that prevented completion of the transition to democracy. == Characteristics == The system works in the following manner: Parties and independent candidates group themselves into lists or coalitions, basically electoral blocs. Each list proposes up to two candidates per electoral region, province, or other geographical unit. Votes are first tallied by list instead of by candidate, and unless the list which obtained the first majority has double the voting as the second majority, each of the two lists gets one of their candidates, the one who got the most voting, into office. In other words, the binomial system basically means that the first and the second majority get equal representation unless the first majority doubles the second. For example, in the following cases the candidate that would get elected under a binomial system are marked with an (): The most common case is Case 2, in which one list gets a total voting that is higher than the other but both get exactly the same amount of candidates elected, candidates 1A and 2A respectively. In the unlikely case that both lists get exactly the same amount of votes each gets a candidate into office. Only in the case that List 1 doubles the voting of List 2 will List 1 be able to get two seats, even if, like in Case 3, the second elected candidate of the majority list received less voting of all the candidates of the two majorities. The system makes it difficult for minority parties to elect candidates: in Case 4, candidate 3A receives the most votes, but under the binomial system, candidates 1A and 2A will be elected. As can be seen, the binomial system acts to equalize the representation of the second majority to the point of making it roughly equal, or only slightly smaller, than that of the first majority. Furthermore, it acts to exclude any minority from the process, in practice generating a locked two-party, or two-bloc, system in which it's exceedingly difficult for one of the blocs to get an upper hand on the other. The table below posits the electoral results of the 2005 lower chamber parliamentary elections with three different voting systems. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Binomial voting system」の詳細全文を読む スポンサード リンク
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