United States v. H&R Block, Inc., 833 F. Supp. 2d 36 (D.D.C. 2011)
The case of United States v. H&R Block, Inc.
Whether H&R Block's proposed acquisition of TaxACT would substantially lessen competition in the digital do-it-yourself (DIY) tax preparation market in violation of Section 7 of the Clayton Act.
Under Section 7 of the Clayton Act, mergers and acquisitions which 'may... substantially... lessen competition' are illegal. Courts assess the impact using the Herfindahl-Hirschman Index (HHI) to determine market concentration and consider factors such as lack of substitute products and potential anti-competitive effects.
The district court granted the DOJ's request for a preliminary injunction, effectively blocking the merger between H&R Block and TaxACT, finding that the merger would likely lead to anticompetitive effects in the market for digital tax preparation services.
United States v. H&R Block, Inc. is significant for antitrust law as it emphasizes the importance of analyzing market concentration and its effects using established quantitative measures. For law students, the case offers insights into how courts balance structural market considerations against competitive dynamics, especially in emerging tech-centric markets like digital services. It also highlights judicial deference to DOJ's assessments in antitrust enforcement.