how do i interpret the herfindahl hirschman index hhi 
a market with an hhi below 1 500 is considered a competitive marketplace an hhi of 1 500 to 2 500 is moderately concentrated and an hhi of 2 500 or greater is highly concentrated as a general rule mergers that increase the hhi by more than 200 points in highly concentrated markets raise antitrust concerns as they are assumed to enhance market power 2