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Expert Analysis

Quickly Calculate HHI Deltas Using This 1 Weird Trick

Law360, New York (March 4, 2016, 10:19 AM EST) -- Antitrust M&A practitioners are well familiar with the Herfindahl-Hirschman Index for measuring market concentration. HHI measurements allow parties and regulators to quickly identify mergers that might cause large increases in concentration and thus may raise questions under the antitrust laws. HHIs, however, can be cumbersome to calculate: Sometimes, just to get a single number — the "delta" between the premerger HHI and post-merger HHI — a practitioner is required to conduct dozens of underlying calculations. However, with just one weird trick, antitrust practitioners can cut to the chase and get deltas quickly, easily and accurately....

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