Market based mechanisms, such as auctions, will represent a widespread means of interaction for electronic commerce on the Internet. This paper is concerned with the problem of determining an efficient bidding policy in simultaneous auctions for goods that exhibit some complementarities and are substitutable. The First International Trading Agent Competition (TAC) held in Boston on July 8th, 2000 represents an interesting benchmark of this type of problems. The bidding policy of our trading agent Nidsia, who took part to the final phase of TAC competition, is described and some experiments testing our agent behavior are reported.
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