Antitrust policies Administered by the doj and ftc Market Concentration Herfindahl-Hirshman Index: HHI=10.0002 w2 Industries in which the HHI exceed 1800 are generally deemed highly concentrated The doj or FTC may, in this case, attempt to block a merger if it would increase the hhi by more than 100 Michael R Baye, Managerial Economics and Business Strategy, 3e. CThe McGraw-Hill Companies, Inc, 1999Michael R. Baye, Managerial Economics and Business Strategy, 3e. ©The McGraw-Hill Companies, Inc. , 1999 Antitrust Policies • Administered by the DOJ and FTC • Market Concentration  Herfindahl-Hirshman Index: HHI = 10,000 S wi 2  Industries in which the HHI exceed 1800 are generally deemed “highly concentrated”.  The DOJ or FTC may, in this case, attempt to block a merger if it would increase the HHI by more than 100