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Four-firm Concentration Ratio
The Four-firm Concentration Ratio measures the market share of the four largest firms within an industry, indicating the level of competition or market concentration.
Herfindahl Index
A measure of market concentration that squares the market share of each firm within an industry to estimate the industry's competitive landscape.
Big Three
A term typically used to refer to the three dominant firms in a specific industry or sector, often used to describe the top auto manufacturers in the United States.
Big Four
A term often referring to the four largest professional services networks in the world, offering audit, assurance, tax, consulting, advisory, actuarial, corporate finance, and legal services.
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