According to U.S. antitrust enforcement guidelines, a merger is likely to be challenged if

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Quizplus · Accepted Answer

According to the Horizontal Merger Guidelines issued by the U.S. Department of Justice and Federal Trade Commission, a merger is likely to be challenged if the post-merger HHI (Herfindahl-Hirschman Index, a measure of market concentration) is above 1,800 and the HHI increases by more than 50 points. Other factors, such as market share, barriers to entry, and potential anticompetitive effects, may also be considered in the analysis, but HHI is a key factor in determining whether a merger is likely to be challenged. Therefore, option B is the correct answer.