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The Psychological Impact of Electoral Laws: Measuring Duverger's Elusive Factor

Published online by Cambridge University Press:  27 January 2009

Extract

Duverger's law regarding the impact of electoral systems on party competition depends upon two effects: the mechanical and the psychological. The former is well defined and well documented, whereas the latter has more often been a matter for theoretical speculation. In this article we provide an operational definition of the psychological effect of electoral systems and measure its impact across twenty democratic systems over more than a century. Our findings suggest that it does exist, that it works as Duverger predicted and that its impact is about the same magnitude as the mechanical effect.

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Articles
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Copyright © Cambridge University Press 1991

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References

1 Duverger, Maurice, Political Parties (London: Methuen, 1954), pp. 215, 224.Google Scholar

2 Duverger, , Political Parties, p. 240.Google Scholar

3 Taagepera, R. and Shugart, M. S., Seats and Votes: The Effects and Determinants of Electoral Systems (New Haven, Conn.: Yale University Press, 1989), p. 65.Google Scholar For a review of the literature see Riker, W. H., ‘Duverger's Law Revisited’, in Grofman, B. and Lijphart, A., eds, Electoral Laws and Their Political Consequences (New York: Agathon Press, 1986).Google Scholar

4 Taagepera, and Shugart, , Seats and Votes, p. xiv.Google Scholar

5 Rae, D. W., The Political Consequences of Electoral Laws (New Haven, Conn.: Yale University Press, 1967).Google Scholar

6 Taagepera, and Shugart, , Seats and Votes, p. 65.Google Scholar

7 Taagepera, and Shugart, , Seats and Votes, p. 65.Google Scholar

8 Taagepera, and Shugart, , Seats and Votes, p. 120.Google Scholar

9 This second process is the one Duverger calls ‘fusion’, arguing that it is one of two ways (party elimination being the other) that bipartism is established. While he does not say as much, Duverger seems to imply that (under the plurality formula) elite activity works through fusion, voter-driven effects through elimination.

10 Riker, , ‘Duverger's Law Revisited’, pp. 33–8.Google Scholar

11 Spafford, D., ‘Electoral Systems and Voters’ Behavior: Comment and a Further Test’, Comparative Politics, 5 (1972), 129–34CrossRefGoogle Scholar; Lemieux, P., ‘The Liberal Party and British Political Change: 1955–1974’ (doctoral dissertation, Massachusetts Institute of Technology, 1977)Google Scholar; Cain, B. E., ‘Strategic Voting in Britain’, American Journal of Political Science, 22 (1978), 639–55CrossRefGoogle Scholar; Blais, A., Renaud, F. and Desrosiers, R., ‘L'effet en amont de la carte électorale: le cas de la région de Québéc a l'élection fédérale de 1968’, Canadian Journal of Political Science, 1 (1974), 648–72.CrossRefGoogle Scholar

12 Shively, W. P., ‘The Elusive Psychological Factor: A Test for the Impact of Electoral Systems on Voters' behavior’, Comparative Politics, 3 (1970), 115–25.CrossRefGoogle Scholar

13 Cain, , ‘Strategic Voting in Britain’, pp. 646–54.Google Scholar

14 Black, J. H., ‘The Multicandidate Calculus of Voting: Application to Canadian Federal Elections’, American Journal of Political Science, 22 (1978), 609–38CrossRefGoogle Scholar, and ‘The Probability-choice Perspective in Voter Decision Making Models’, Public Choice, 35 (1980), 565–74Google Scholar; Bensel, R. F. and Sanders, M. E., ‘The Effect of Electoral Rules on Voting Behavior: The Electoral College and Shift Voting’, Public Choice, 34 (1979), 6985.CrossRefGoogle Scholar

15 Riker, , ‘Duverger's Law Revisited’, p. 38.Google Scholar

16 Johnston, R., Elkins, D. and Blake, D., ‘Strategic Voting: Individual Reasoning and Collective Consequences’, paper presented at the annual meeting of the American Political Science Association, Washington, DC, 1980Google Scholar; Blais, A., Johnston, R., Brady, H. and Crete, J., ‘The Dynamics of Horserace Expectations in the 1988 Canadian Election’Google Scholar, paper presented at the annual meeting of the Canadian Political Science Association, Victoria, 1990; Bensel, and Sanders, , ‘The Effect of Electoral Rules’, p. 82.Google Scholar

17 The descriptive analysis Duverger provides depends a great deal on this latter approach.

18 Fisher, S. L., ‘The Wasted Vote Thesis: West German Evidence’, Comparative Politics, 6 (1973), 295–9Google Scholar; Shugart, M., ‘The Two Effects of District Magnitude: Venezuela as a Crucial Experiment’, European Journal of Political Research, 13 (1985), 353–64.CrossRefGoogle Scholar

19 Duverger, , Political Parties, pp. 239–45Google Scholar, is ambivalent about the second ballot and thinks the factors at work on it ‘are not entirely identical’ with the influences generated by proportional electoral regimes. He is not as interested in majority systems which he writes of as old, little used and, by implication, less important.

20 Mackie, T. T. and Rose, R., The International Almanac of Electoral History (London: Macmillan, 1982).CrossRefGoogle Scholar

21 Where bicameral legislatures exist only contests for the popular (lower) house are recorded.

22 The Mackie and Rose Almanac includes all parties that have at least once secured more than 1 per cent of the vote in a national election.

23 Laakso, M. and Taagepera, R., ‘Effective Number of Parties: A Measure With Application to West Europe’, Comparative Political Studies, 12 (1979), 327.CrossRefGoogle Scholar

24 The leading party is defined as the one with a plurality of the vote.

25 Rae, , Political Consequences, pp. 114–25Google Scholar; Taagepera, R., ‘Effect of District Magnitude and Properties of Two-Seat Districts’, in Lijphart, A. and Grofman, B., eds, Choosing an Electoral System: Issues and Alternatives (New York: Praeger, 1984), pp. 92–8Google Scholar, and ‘Reformulating the Cube Law for Proportional Representation Elections’, American Political Science Review, 80 (1986), 489504.Google Scholar

26 This data constraint is perhaps the major limitation of this study. But even Taagepera and Shugart's Seats and Votes is missing data for various countries for particular periods and relies on guesstimates for others. See their Table 12.2, pp. 138–9, where, for instance, data for Denmark, 1913–32 is missing, while question marks signal uncertainty about cases like Germany 1920–33.

27 For an analysis of Japan, see Reed, Steven R., ‘Structure and Behaviour: Extending Duverger's Law to the Japanese Case’, British Journal of Political Science, 20 (1990) 335–56.CrossRefGoogle Scholar

28 Taagepera, and Shugart, , Seatsand Votes, pp. 173–83.Google Scholar

29 These propositions are derived from a broad literature, including Taagepera, , ‘Reformulating the Cube Law’Google Scholar; Carstairs, A. M., A Short History of Electoral Systems in Western Europe (London: Allen and Unwin, 1980)Google Scholar; Riker, , ‘Duverger's Law Revisited’Google Scholar; and Duverger, M., ‘Duverger's Law: Forty Years Later’Google Scholar, in Grofman, and Lijphart, , Electoral Laws.Google Scholar

30 Powell, G. B., Contemporary Democracies: Participation, Stability and Violence (Cambridge, Mass.: Harvard University Press, 1972)Google Scholar; Rose, R., ‘Elections and Electoral Systems: Choices and Alternatives’, in Bogdanor, V. and Butler, D., eds, Democracy and Elections: Electoral Systems and Their Political Consequences (Cambridge: Cambridge University Press, 1983).Google Scholar

31 For estimates, see Taagepera, and Shugart, , Seats and Votes, Table 12.2, p. 138.Google Scholar This may also testify to the difficulty of producing reliable district magnitude data.

32 This estimate is difficult to compare with Rae's in The Political Consequences of Electoral Laws given the different data bases and the numerous classification errors identified by Lijphart, A. in ‘The Political Consequences of Electoral Laws, 1945–85’, American Political Science Review, 84 (1990).CrossRefGoogle Scholar

33 Taagepera, and Shugart, , Seatsand Votes, p. 214.Google Scholar

34 For a graphical presentation of an analysis which rests upon numerical estimates of district magnitude, see Taagepera, and Shugart, , Seats and Votes, Figure 13.2, p. 144.Google Scholar