As an aid to the interpretation of market data,the Justice Department uses the Herfindahl-Hirschman Index (HHI)of

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The Herfindahl-Hirschman Index (HHI) is used as a measure of market concentration. This index is a commonly used tool to assess the competitive environment within a specific industry. It takes into account the market share of each firm in the industry and can indicate whether a particular industry is highly concentrated or more competitive. The Justice Department uses this index to evaluate market competition and investigate potential antitrust violations. Therefore, option D is the best choice.

As an Aid to the Interpretation of Market Data,the Justice