Science and Education Publishing Journal of Behavioural Economics Finance Entrepreneurship Accounting and Transport 2376-1334 4 2 2016 6 27 The Effect of Information Feedback on Bidding Behavior: Experimental Study on Regret Theory in Auctions 18 23 EN Masao Nagatsuka Department of Economics, Tezukayama University, Nara, Japan JBE2016421 10.12691/jbe-4-2-1 2016 1 7 2016 5 26 2016 6 25 The present study investigates whether information feedback affects bidding behavior in first price auctions. Feedback differences significantly affect bidding in the literature. As a possible explanation, preceding study built regret anticipation model and shown that information feedback on the loser can be a driving force for overbidding relative to risk neutral Nash equilibrium predictions. However, the question if actual regret experience affects bidding remains unanswered. Furthermore, whether an opportunity for regret distort posterior decision is unanswered. Therefore, an experiment was conducted to test whether actual regretful feedback causes overbidding by using a repeated design experiment. Experimental results indicate that feedback information on bidding results does not cause significant overbidding in the first round, but loser regret sensitive bidders tend to overbid in the next round.