Introduction Guest Editor's Introduction Mema Roussopoulos i Feature Articles Markets are Dead, Long Live Markets Kevin Lai 1 Incentives for Content Availability in Memory-less Peer-to-Peer File Sharing Systems Panayotis Antoniadis, Costas Courcoubetis and Ben Strulo 11 A Non-Manipulable Trust System Based on EigenTrust Zoe Abrams, Robert McGrew and Serge Plotkin 21 Drawing Crowds and Bit Welfare Eytan Adar 31 Overcoming Free-Riding Behavior in Peer-to-Peer Systems Michal Feldman and John Chuang 41 Conference Reports Conference Report: The Sixth ACM Conference on Electronic Commerce Jeffrey Shneidman 51 ISSN 1551-9031