This volume contains 9 thoroughly refereed and revised papers detailing recent advances in
research on designing trading agents and mechanisms for agent-mediated e-commerce. They were
originally presented at the 12th International Workshop on Agent-Mediated Electronic Commerce
(AMEC 2010) collocated with AAMAS 2010 in Toronto Canada or the 2010 Workshop on Trading
Agent Design and Analysis (TADA 2010) collocated with EC 2010 in Cambridge MA USA. The
papers examine emerging topics such as ad auctions and supply chains or the interactions
between competing markets and present novel algorithms and rigorous theoretical results.
Several of them evaluate their results using real data from large e-commerce sites or from
experiments with human traders.
