Herfindahl-Hirschman Index (HHI).

The Herfindahl-Hirschman Index (HHI) is a measure of market concentration. It is calculated by summing the squares of the market share of each firm in the market. The HHI ranges from 0 to 1, with 0 indicating perfect competition and 1 indicating a monopoly. The HHI can be used to assess whether a market is … Read more