Give a compelling (technical) argument why the tit-for-tat policy (i.e., a lecan be downloaded only when the downloading client is providing contentto someone else) as used in BitTorrent is far from optimal for le sharing inthe Internet.
The reasoning is relatively simple. Most BitTorrent clients are operatedbehind asymmetric links such as provided by ADSL or cable modems. Ingeneral, clients are oered a high incoming bandwidth capacity, but no onereally expects that clients have services to oer. BitTorrent does not makethis assumption, and turns clients into collaborative servers. Having sym-metric connections is then a much better match for the tit-for-tat policy.