The First Trading Agent Competition (TAC) was held from June 22nd to July 8
th, 2000. TAC was designed to create a benchmark problem in the complex dom
ain of e-marketplaces and to motivate researchers to apply unique approache
s to a common task. This article describes ATTac-2000, the first-place fini
sher in TAC. ATTac-2000 uses a principled bidding strategy that includes se
veral elements of adaptivity. In addition to the success at the competition
, isolated empirical results are presented indicating the robustness and ef
fectiveness of ATTac-2000's adaptive strategy.