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Peer-To-Peer (P2P) architectures are gaining increasing popularity in disseminating content to a large number of nodes. In this paper, the authors show that small coalitions between peers can further enhance the performance of current P2P architectures. Small coalitions bridge the gap between inefficient non-cooperative and fully cooperative architectures by establishing a robust trade-off between the complexity and performance of the resource distribution process. Owing to their small size, small coalitions are inherently resilient to the churn in existing P2P systems and embed natural incentives for peers to self-organize in order to improve their download times.
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