Editor s Introduction I am very happy to introduce Issue 7.2 of SIGecom Exchanges. This is the second issue of the Exchanges since its makeover. The makeover changed the focus from full-length articles to letters, in which authors can give a quick overview of recent research, review a recent conference or book, or lay out their opinions on where research is or should be heading. Full-length articles continue to be welcome, though. Issue 7.1 was a special issue dedicated to combinatorial auctions; in contrast, Issue 7.2 does not have a speci c topic, resulting in a greater variety of topics related to e-commerce. Nevertheless, auctions continue to be well represented. The rst contribution in this issue is an announcement of the book Autonomous Bidding Agents: Strategies and Lessons from the Trading Agent Competition by Wellman, Greenwald, and Stone. The book tells the story of the development and evolution of the Trading Agent Competition(s), gives detailed analyses of speci c TAC techniques, and develops some general foundations for trading agent design. The next four letters concern incentive compatibility (also known as truthfulness or strategyproofness). In Truthful Opinions from the Crowds, Jurca and Faltings review their work on
/lp/association-for-computing-machinery/editor-s-introduction-n9eeRo0Ejd