This book constitutes the thoroughly refereed post-conference proceedings of the 9th International Workshop on Agent-Mediated Electronic Commerce, AMEC IX, co-located with the Sixth International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS 2007, held in Honolulu, Hawai, in May 2007, and the 5th Workshop on Trading Agent Design and Analysis, TADA 2007, co-located with the Twenty-Second AAAI Conference on Artificial Intelligence, AAAI 2007, held in Vancouver, Canada, in July 2007. This volume presents 15 carefully revised and selected papers from these workshops. The primary and complementary goal of both workshops was to continue to bring together novel work from diverse fields on modeling, implementation and evaluation of computational trading institutions and/or agent strategies. The papers originating from AMEC focus on a large variety of issues on auctions, negotiation, and strategic behavior in electronic marketplaces. The papers originating from TADA reflect the effort of the community to design scenarios where trading agent designers and market designers can be pitched against one another.

Inhalt
On Revenue-Optimal Dynamic Auctions for Bidders with Interdependent Values.- Sequential Auctions in Uncertain Information Settings.- Adapting Price Predictions in TAC SCM.- Exploiting Hierarchical Goals in Bilateral Automated Negotiation: Empirical Study.- Theoretically Founded Optimization of Auctioneer's Revenues in Expanding Auctions.- Designing Bidding Strategies in Sequential Auctions for Risk Averse Agents: A Theoretical and Experimental Investigation.- Traffic Management Based on Negotiations between Vehicles A Feasibility Demonstration Using Agents.- On Choosing an Efficient Service Selection Mechanism in Dynamic Environments.- Adaptive Sniping for Volatile and Stable Continuous Double Auction Markets.- On the Empirical Evaluation of Mixed Multi-Unit Combinatorial Auctions.- Analysing Buyers' and Sellers' Strategic Interactions in Marketplaces: An Evolutionary Game Theoretic Approach.- Reducing Interaction Costs for Self-interested Agents.- Using Information Gain to Analyze and Fine Tune the Performance of Supply Chain Trading Agents.- On the Behavior of Competing Markets Populated by Automated Traders.- Marginal Bidding: An Application of the Equimarginal Principle to Bidding in TAC SCM.