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Four-Firm Concentration
is a metric that measures the total market share held by the four largest firms within an industry, indicating the level of market concentration and competition.
Barriers to Entry
Obstacles that make it difficult for new competitors to enter a market.
Oligopoly
A market structure characterized by a small number of firms whose decisions about production and pricing significantly affect the market.
Herfindahl Index
A measure of market concentration that sums the squares of the market share percentages of all firms within the industry, used to assess the level of competition.
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