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If the post-merger HHI is less than 1,000, the industry is considered competitive and an antitrust challenge is unlikely. A post-merger HHI value between 1,000 and 1,800 will place the industry in the moderately concentrated category. In this case, regulators will compare the pre-merger and post-merger HHI. If the change is greater than 100 points, the merger is likely to be challenged on antitrust grounds. A post-merger HHI calculation greater than 1,800 implies a highly concentrated industry. Regulators will again compare the pre-merger and post-merger HHI calculations, but in this case, if the change is greater than 50, the merger is likely to be challenged.