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In this paper, the authors present a model of peer-to-peer backup and storage systems in which users have the ability to selfishly select remote peers they want to exchange data with. In their work, peer characteristics (e.g., on-line availability and dedicated bandwidth) play an important role and are reflected in the model through a single parameter, termed profile. They show that selecting remote peers selfishly, based on their profiles, creates incentives for users to improve their contribution to the system. Their work is based on an extension to well known results in Matching Theory, which allows one to formulate the Stable Exchange Game, in which they shift the algorithmic nature of matching problems to a game theoretic framework.
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