Herfindahl-Hirschman Index
Compute the pre-merger HHI for an industry with 10 competitors and the given market shares. How would the HHI change if Companies B and C merged? How would it change if Companies I and J merged instead? Would either set of mergers be likely to evoke an antitrust challenge?
Company A B C D E F G H I J
Market Share (%) 25 20 10 10 10 5 5 5 5 5

Q&A Education