Changing the Rules: Political Competition Under Plurality and Proportionality
Posted: 23 Oct 2002
From the wide range of voting schemes, two electoral rules, proportional representation (PR) and plurality (PL) attract primary interest. This paper examines the relationship between proportionality, voter information and a conception of the power of competing political parties under the differing electoral rules. Data are from three Sicilian provincial elections (1985, 1990 and 1994). Two measures of power and two measures of proportionality are used and Olson's theory of groups is applied to derive a measure of voter information. The results indicate that proportionality and voter information have a negative effect on political party power dilution under PR rules. However, these effects disappear under PL rules. We offer some interpretations of these findings.
Keywords: Plurality, proportionality, political competition
JEL Classification: D70, D72
Suggested Citation: Suggested Citation