Introduction Editor's Introduction William E. Walsh i Feature Articles Yootopia! Daniel M. Reeves, Bethany M. Soule, and Tejaswi Kasturi 1 Bayes-Nash Equilibria For m-th Price Auctions With Multiple Closing Times Ioannis A. Vetsikas and Bart Selman 27 Relaxed-criteria G-negotiation for Grid Resource Co-allocation (Position Paper) Kwang Mong Sim 37 What Keeps Online Customers Repurchasing through the Internet? Kanokwan Atchariyachanvanich, Hitoshi Okada and Noboru Sonehara 47 ISSN 1551-9031