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Distribution of coalitional power in randomized multi-valued social choice


  • Shasikanta Nandeibam

    () (Department of Economics, University of Birmingham, Birmingham, B15 2TT, UK)


This paper considers the distribution of coalitional influence under probabilistic social choice functions which are randomized social choice rules that allow social indifference by mapping each combination of a preference profile and a feasible set to a social choice lottery over all possible choice sets from the feasible set. When there are at least four alternatives in the universal set and ex-post Pareto optimality, independence of irrelevant alternatives and regularity are imposed, we show that: (i) there is a system of additive coalitional weights such that the weight of each coalition is its power to be decisive in every two-alternative feasble set; and (ii) for each combination of a feasible proper subset of the universal set and a preference profile, the society can be partioned in such a way that for each coalition in this partition, the probability of society's choice set being contained in the union of the best sets of its members is equal to the coalition's power or weight. It is further shown that, for feasible proper subsets of the universal set, the probability of society's choice set containing a pair of alternatives that are not jointly present in anyone's best set is zero. Our results remain valid even when the universal set itself becomes feasible provided some additional conditions hold.

Suggested Citation

  • Shasikanta Nandeibam, 2003. "Distribution of coalitional power in randomized multi-valued social choice," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 20(1), pages 3-25.
  • Handle: RePEc:spr:sochwe:v:20:y:2003:i:1:p:3-25
    Note: Received: 10 May 1999/Accepted: 18 June 2000

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    Cited by:

    1. Indraneel Dasgupta, 2011. "Contraction consistent stochastic choice correspondence," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 37(4), pages 643-658, October.
    2. Saralees Nadarajah, 2009. "The Pareto optimality distribution," Quality & Quantity: International Journal of Methodology, Springer, vol. 43(6), pages 993-998, November.

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