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Contextual Determinants of Electoral System Choice - Åbo Akademi

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subtypes: (1) plurality-PR corrective, (2) plurality-PR combination, (3) plurality-PR coexistence + combination, and (4) majority-PR combination + corrective(Blais and Massicotte 1996: 52-67).In addition to constituency structure, PR countries are classified according towhich allocation formula (LR-Hare, LR-Droop, d’Hondt or modified Sainte-Laguë) they apply, and information on whether they use closed lists, preferentialvoting or panachage is provided (1996: 57-60). 11 Furthermore, the authors presenta typology <strong>of</strong> threshold structure in proportional representation systems. Initially,PR systems with legal thresholds are distinguished from those without thresholds.Thereafter, two forms <strong>of</strong> threshold structure are identified: thresholds for getting aseat at a higher level in systems with several tiers, and thresholds for getting a localseat (1996: 62-63). Hence, the classification <strong>of</strong> PR systems takes four dimensionsinto consideration: constituency structure, electoral formula, legal threshold, andpreferences for candidates. The authors maintain that due to the many differentways <strong>of</strong> combining these elements, no PR systems are exactly alike. They do not,however, distinguish between BV and LV (1996: 49-81).2.4 A Typology <strong>of</strong> <strong>Electoral</strong> <strong>System</strong>sThere is a great variety <strong>of</strong> electoral formulas and a classification <strong>of</strong> these into a fewmain categories is needed in order to conduct empirical analysis. Several previousclassifications distinguish between plurality/majority, semi-proportional andproportional systems. Another common ground <strong>of</strong> classification is to divideformulas into plurality, majority, proportional and mixed electoral systems. Mostclassifications follow one <strong>of</strong> these two principles, sometimes with smallmodifications. If electoral formulas are classified according to degrees <strong>of</strong>proportionality, plurality and majority formulas are brought together into a singlemajoritarian category. Both the plurality and the majority rule usually producemuch more disproportional results than proportional systems. Exceptions are LV(including SNTV) and CV, which tend to produce more proportional results thanother plurality and majority formulas, but not as proportional as list PR and STV.Despite seat allocation according to the plurality rule, these formulas consequentlybelong to the intermediary category.11 The French term panachage implies that voters are entitled to cast multiple votes and to split their votes betweencandidates in one list as well as between lists.43

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