Strategic Cooperation in Cost Sharing Games

  • Martin Hoefer
Conference paper

DOI: 10.1007/978-3-642-17572-5_21

Part of the Lecture Notes in Computer Science book series (LNCS, volume 6484)
Cite this paper as:
Hoefer M. (2010) Strategic Cooperation in Cost Sharing Games. In: Saberi A. (eds) Internet and Network Economics. WINE 2010. Lecture Notes in Computer Science, vol 6484. Springer, Berlin, Heidelberg


In this paper we consider a large variety of strategic cost sharing games with so-called arbitrary sharing based on various combinatorial optimization problems, such as vertex and set cover, facility location, and network design problems. We concentrate on the existence and computational complexity of strong equilibria, in which no coalition can decrease the cost of every member.

Our main result reveals a connection between strong equilibrium in strategic games and the core in traditional coalitional cost sharing games studied in economics. For set cover and facility location games this results in a tight characterization of the existence of strong equilibrium using the integrality gap of suitable linear programming formulations.In addition, we are able to show that in general the strong price of anarchy is always 1, whereas the price of anarchy is known to be Θ(n) for Nash equilibria. Finally, we indicate that the LP-approach can also be used to compute near-optimal and near-stable approximate strong equilibria.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Martin Hoefer
    • 1
  1. 1.Dept. of Computer ScienceRWTH Aachen UniversityGermany

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