I would like to thank many of my former colleagues at the Department of Justice, including Craig Conrath, Renata Hesse, Aaron Hoag, Russ Pittman, David Reitman, Dan Rubinfeld, and Greg Werden, as well as Jonathan Baker, Cory Capps, George Deltas, Luke Froeb, Jeffrey MacKie-Mason, Roger Noll, Dan O'Brien, Richard Quandt, Lars-Hendrik Röller, Steve Salop and Margaret Slad; seminar participants at the Federal Trade Commission, Georgia Tech, SUNY Stony Brook, and Wissenschaft Zentrum Berlin; and participants at the meetings of the American Economic Association, the European Association of Research in Industrial Economics, the Southern Economics Association, and Western Economics Association. The Association of Research Libraries and its members, the National Library of Medicine, the Georgia Tech Library, and the Georgia Tech Foundation have provided invaluable assistance. Expert data support was provided by a large group of individuals, including Deena Bernstein, Claude Briggs, Pat Finn, Doug Heslep and Steve Stiglitz. Finally, I would like to thank the dozens of librarians and publishers who have provided me with important insights.

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