Internet auctions have received a considerable amount of attention from researchers. We review recent empirical literature pertaining to single-item Internet auctions and observe that existing work has examined the roles of the auctioneer, bidder, and seller in Internet auctions. As this stream of research matures, research will necessarily move from concept discovery and process explanation to theory deepening. As a first step towards synthesis of findings in Internet auctions, we compile a comprehensive list of the various factors that have been examined in empirical studies and note their general impact upon auction outcome. Based upon this extant research, we propose a conceptual model of Internet auctions as a framework for structuring future work into Internet auctions. We then note the existing economic, psychological, sociological, and cognitive theoretical bases for work on Internet auctions. We conclude by highlighting the potential for behavioral economics to bring unity to Internet auction research and by calling researchers to engage in the work of forging a comprehensive theory of Internet auctions.