This section presents empirical results demonstrating the effectiveness of the ATTac-2001 strategy. First, we summarize its performance in the 2001 and 2002 Trading Agent Competitions (TACs). These summaries provide evidence of the strategy's overall effectiveness, but, due to the small number of games in the competitions, are anecdotal rather than scientifically conclusive. We then present controlled experiments that provide more conclusive evidence of the utility of our decision theoretic and learning approaches embedded within ATTac-2001.