On the Performance of Approximate Equilibria in Congestion Games

Authors:
George Christodoulou;Elias Koutsoupias;Paul G. Spirakis
Affiliations:
University of Saarland, Department of Computer Science, Saarbrücken, Germany;University of Athens, Department of Informatics, Athens, Greece;Patras University, Computer Engineering and Informatics Department, Patras, Greece
Venue:
Algorithmica - Special Issue: European Symposium on Algorithms, Design and Analysis
Year:
2011

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Abstract

We study the performance of approximate Nash equilibria for congestion games with polynomial latency functions. We consider how much the price of anarchy worsens and how much the price of stability improves as a function of the approximation factor ε. We give tight bounds for the price of anarchy of atomic and non-atomic congestion games and for the price of stability of non-atomic congestion games. For the price of stability of atomic congestion games we give non-tight bounds for linear latencies. Our results not only encompass and generalize the existing results of exact equilibria to ε-Nash equilibria, but they also provide a unified approach which reveals the common threads of the atomic and non-atomic price of anarchy results. By expanding the spectrum, we also cast the existing results in a new light.