Abstract
When forming coalitions, agents have different utilities per coalition. Game-theoretic approaches typically assume that the scalar utility for each agent for each coalition is public information. However, we argue that this is not a realistic assumption, as agents may not want to divulge this information or are even incapable of expressing it. To mitigate this, we propose the multi-criteria coalition formation game model, in which there are different publicly available quality metrics (corresponding to different criteria) for which a value is publicly available for each coalition. The agents have private utility functions that determine their preferences with respect to these criteria, and thus also with respect to the different coalitions. Assuming that we can ask agents to compare two coalitions, we propose a heuristic (best response) algorithm for finding stable partitions in MC2FGs: local stability search (LSS). We show that while theoretically individually stable partitions need not exist in MC2FGs in general, empirically stable partitions can be found. Furthermore, we show that we can find individually stable partitions after asking only a small number of comparisons, which is highly important for applying this model in practice.
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Acknowledgements
We are grateful for very useful comments by the anonymous reviewers at ADT and CoopMAS, and thank Edith Elkind for her helpful suggestions. Diederik M. Roijers is a postdoctoral fellow of the Research Foundation – Flanders (FWO). This work is in part supported by the EC-FP7 under grant agreement no. #611153 (TERESA).
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Igarashi, A., Roijers, D.M. (2017). Multi-criteria Coalition Formation Games. In: Rothe, J. (eds) Algorithmic Decision Theory. ADT 2017. Lecture Notes in Computer Science(), vol 10576. Springer, Cham. https://doi.org/10.1007/978-3-319-67504-6_14
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DOI: https://doi.org/10.1007/978-3-319-67504-6_14
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