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A Simple Direction Model of Electoral Competition

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  • Matthews, Steven A.

Abstract

The direction model of the electoral process allows limits to candidate mobility or voter perception and cognition. It is applicable (1) if only issue outcomes near the status quo are associated with candidates; (2) if only directional information is transmitted to voters; (3) if voter preferences are only well-defined near the status quo or are only defined for directions in which it can shift; or (4) if the outcome space is curved so that it can be modeled as a hypersphere. Assuming that a voter will vote for the candidate who campaigns for a direction closest to his own preferred direction, plurality equilibria were shown to be undominated. Equilibrium and undominated directions were shown to be indentical if nobody is totally indifferent. Then a necessary and sufficient condition for the existence of undominated directions was determined. The first part of the condition, stating that any hyperplane containing the undominated direction vector and the origin bisects the distribution of preferred directions, is analogous to the total median condition in the simple Euclidean models. The remainder of the condition in Theorem 2, stating that a majority of the electorate's preferred direction vectors lie on the same side as the undominated direction vector of any hyperplane containing the origin, is not implied by the median-like property in this model because of the ‘curved’ nature of the directional domain space. The second part of the condition is what allows a candidate to diverge from a fixed direction chosen by an extremist opponent, where at least half the feasible directions are defined to be extremist for every distribution of the electorates' preferred directions. Although the addition of a second part to the characterizing condition for equilibrium seems to further decrease the likelihood of its occurrence, it was shown that in situations where the assumptions of the simple Euclidean model are met, point equilibria exist only if corresponding undominated dir
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  • Matthews, Steven A., "undated". "A Simple Direction Model of Electoral Competition," Working Papers 128, California Institute of Technology, Division of the Humanities and Social Sciences.
  • Handle: RePEc:clt:sswopa:128
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    File URL: http://www.hss.caltech.edu/SSPapers/sswp128c.pdf
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    References listed on IDEAS

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    1. McKelvey, Richard D, 1975. "Policy Related Voting and Electoral Equilibrium," Econometrica, Econometric Society, vol. 43(5-6), pages 815-843, Sept.-Nov.
    2. Anthony Downs, 1957. "An Economic Theory of Political Action in a Democracy," Journal of Political Economy, University of Chicago Press, vol. 65, pages 135-135.
    3. Judith Sloss, 1973. "Stable outcomes in majority rule voting games," Public Choice, Springer, vol. 15(1), pages 19-48, June.
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    1. Larry Samuelson, 1984. "Electoral equilibria with restricted strategies," Public Choice, Springer, vol. 43(3), pages 307-327, January.

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