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  1. Group Decision Making Under Uncertainty a Note on the Aggregation of “Ordinal Probabilities”.Jean Laine, Michel Le Breton & Alain Trannoy - 1986 - Theory and Decision 21 (2):155-161.
    This paper is a first attempt to study the problem of aggregation of individual ordinal probabilistic beliefs in an Arrowian framework. We exhibit some properties an aggregation rule must fulfil; in particular we prove the existence of a “quasi-dictator”.
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    Pareto Efficiency in Multiple Referendum.Tuğçe Çuhadaroğlu & Jean Lainé - 2012 - Theory and Decision 72 (4):525-536.
    We consider situations of multiple referendum: finitely many yes-or-no issues have to be socially assessed from a set of approval ballots, where voters approve as many issues as they want. Each approval ballot is extended to a complete preorder over the set of outcomes by means of a preference extension. We characterize, under a mild richness condition, the largest domain of top-consistent and separable preference extensions for which issue-wise majority voting is Pareto efficient, i.e., always yields out a Pareto-optimal outcome. (...)
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    The Budget-Voting Paradox.Gilbert Laffond & Jean Lainé - 2008 - Theory and Decision 64 (4):447-478.
    The budget-voting paradox states that, when social alternatives are proper subsets of a finite set of decisions, choosing decision-wise according to the majority rule may select an alternative that is covered in the majority tournament among alternatives. Individual preferences are defined on single decisions, and are extended to preferences over the alternative set by means of a preference extension rule. We prove the existence of the paradox for any rank-based, monotone, and independent extension rule.
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    Weak Covering Relations.Gilbert Laffond & Jean Laine - 1994 - Theory and Decision 37 (3):245-265.
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