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Part of the book series: Studies in Fuzziness and Soft Computing ((STUDFUZZ,volume 305))

Abstract

Group decision making, as meant in this paper, is the following choice problem which proceeds in a multiperson setting. There is a group of individuals (decision makers, experts, …) who provide their testimonies concerning an issue in question as individual preference relations over some set of option (alternatives, variants, …). The problem is to find a solution, i.e., an alternative or a set of alternatives which best reflects the preferences of the group of individuals as a whole. First, we survey main developments in group decision making under fuzziness and outline some basic inconsistencies and negative results in group decision making and social choice, and show how they can be alleviated by some plausible modifications of underlying assumptions, mainly by introducing fuzzy preference relations and a fuzzy majority. We concentrate on how to derive solutions under individual fuzzy preference relations, and a fuzzy majority equated with a fuzzy linguistic quantifier (e.g., most, almost all, …), and discuss a related issue of how to define a “soft” degree of consensus in the group. Finally, we show how fuzzy preferences can help alleviate some known voting paradoxes.

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Kacprzyk, J., Zadrożny, S., Nurmi, H., Fedrizzi, M. (2013). On Some Voting Paradoxes: A Fuzzy Preference and a Fuzzy Majority Perspective. In: Ventre, A., Maturo, A., Hošková-Mayerová, Š., Kacprzyk, J. (eds) Multicriteria and Multiagent Decision Making with Applications to Economics and Social Sciences. Studies in Fuzziness and Soft Computing, vol 305. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35635-3_17

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  • DOI: https://doi.org/10.1007/978-3-642-35635-3_17

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