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Herfindahl-Hirschman Index (HHI) is a measure of market concentration, and is used by the U.S. Department of Justice and the Federal Trade Commission to analyze competition. It is calculated by summing the squared market share of all competitors in a market, and is used to measure the level of competition in a market. The higher the HHI, the more concentrated the market. News articles about Herfindahl-Hirschman Index often focus on the implications of the index for competition and antitrust law. For example, a news article might discuss how the index is used to determine whether a merger or acquisition would create a monopoly, or how the index is used to measure the competitive effect of proposed mergers and acquisitions. Other news articles might discuss how the index is used to assess the level of competition in a particular industry or geographic region. Articles about Herfindahl-Hirschman Index typically provide an overview of how the index is calculated and how it is used in antitrust law. They also often discuss how the index has been used in recent mergers and acquisitions, and the implications for competition. Videos about Herfindahl-Hirschman Index typically provide an overview of the index and how it