Comparisons among electoral systems: Distinguishing between localism and candidate-centered politics

Carey and Shugart (1995) offer a four component composite index of “incentives to cultivate a personal vote.” We argue that this index, while tapping important aspects of electoral system choice, is best regarded as encompassing two distinct dimensions: degree of party-centeredness of the electoral system, on the one hand, and incentives for “parochial” behavior on the part of legislators, on the other. Also, while we have no problem with the three indicators used by Carey and Shugart to measure party-centeredness; to measure parochial incentives we prefer to use a new measure, E (Grofman, 1999a) of the size of a legislator's electoral constituency, rather than using district magnitude, m, as a proxy for a the size of a legislator's geographic constituency, as Carey and Shugart do. In the conclusion to the paper we argue that the degree of similarity between any two electoral systems will depend upon the research question at issue, and that the expected degree of proportionality of election results is only one of the many political consequences of electoral laws to which we ought to be paying attention.