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The US Department of Justice (DOJ) and Federal Trade Commission (FTC) have solicited public comments and are holding five joint public workshops to explore the possibility of updating the Horizontal Merger Guidelines that are used by both agencies to evaluate the potential competitive effects of mergers and acquisitions. The goals of the workshops are to determine whether the Horizontal Merger Guidelines accurately reflect the current practice of merger review at the DOJ and the FTC as well as to take into account legal and economic developments that have occurred since the last significant Guidelines revision in 1992. NERA Special Consultant Dr. Michael Baye was invited to participate in the third workshop, which was held in Chicago on 10 December 2009, and provided his views on efficiencies in horizontal mergers in a panel discussion.