The Antitrust Division of the U.S. Department of Justice officially announced that it would be reviewing the merger on March 6, 2014 [REF].
The DOJ commonly uses the Herfindahl index (HHI) to measure market concentration, designating markets between 1,500 points and 2,500 points as "moderately concentrated" and those above 2,500 points as "highly concentrated" [REF].