Key points are not available for this paper at this time.
Martin J. Osborne, Spatial Models of Political Competition under Plurality Rule: A Survey of Some Explanations of the Number of Candidates and the Positions They Take, The Canadian Journal of Economics / Revue canadienne d'Economique, Vol. 28, No. 2 (May, 1995), pp. 261-301
Martin J. Osborne (Mon,) studied this question.