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Despite many excellent research papers, we still do not fully understand the motives behind mergers and tender offers or whether they bring an increase in aggregate market value. In their comprehensive review article (from which the above quote is taken), Jensen and Ruback (1983) summarize the empirical work presented in over 40 The hubris hypothesis is advanced as an explanation of corporate takeovers. Hubris on the part of individual decision makers in bidding firms can explain why bids are made even when a valuation above the current market price represents a positive valuation error. Bidding firms infected by hubris simply pay too much for their targets. The empirical evidence in mergers and tender offers is reconsidered in the hubris context. It is argued that the evidence supports the hubris hypothesis as much as it supports other explanations such as taxes, synergy, and inefficient target management. * The earlier drafts of this paper elicited many comments. It is a pleasure to acknowledge the benefits derived from the generosity of so many colleagues. They corrected several conceptual and substantive errors in the previous draft, directed my attention to other results, and suggested other interpretations of the empirical phenomena. In general, they provided me with an invaluable tutorial on the subject of corporate takeovers. The present draft undoubtedly still contains errors and omissions, but this is due mainly to my inability to distill and convey the collective knowledge of the profession. Among those who helped were C. R. Alexander, Peter Bernstein, Thomas Copeland, Harry DeAngelo, Eugene Fama, Karen Farkas, Michael Firth, Mark Grinblatt, Gregg Jarrell, Bruce Lehmann, Paul Malatesta, Ronald Masulis, David Mayers, John McConnell, Merton Miller, Stephen Ross, Richard Ruback, Sheridan Titman, and, especially, Michael Jensen, Katherine Schipper, Walter A. Smith, Jr., and J. Fred Weston. I also benefited from the comments of the finance workshop participants at the University of Chicago, the University of Michigan, and Dartmouth College, and of the referees.