The bandwidth demands made on any individual par- ticipant in each multicast tree are quite innocuous. For example, an RSS feed generating 4 KB/hour of updates will cause an interior tree node with 16 children to for- ward less than 20 bytes per second of outbound traffic. Due to the extremely low forwarding overhead, we be- lieve that the motivation for freeloading is very small. In the future, we expect richer content feeds, and con- sequently, the potential incentive for freeloading may increase. Incentives-compatible mechanisms to ensure fair sharing of bandwidth [20] can be applied if most users subscribe to several feeds, which is a common model of RSS usage. We intend.
