Under current guidelines, the Federal Trade Commission will likely challenge Group of answer choices a merger if the HHI is 2500 or higher and the merger increases the HHI by more than 50 points. a merger if the HHI is 1500 or higher and the merger increases the HHI by more than 300 points. all mergers if the Herfindahl-Hirschman index (HHI) is 2500 or higher. a merger if the HHI is 2500 or higher and the merger increases the HHI by more than 200 points