By agreeing to treat requests, a peer knows that she is contributing to reducing congestion and augmenting the probability of her own requests being treated rapidly. If all members having a cost lower than cˆ 2 [c
¯ , c¯ ] agree to contribute, then the proportion of contributors will be F๐cˆ
R cˆ c f ๐cdc R cˆ c dF๐c.