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Marginal Revenue
The additional income earned from selling one more unit of a good or service; it's a crucial concept for understanding how firms decide on output levels.
Purely Competitive Industry
An industry characterized by a large number of small firms producing identical products with no single firm able to influence the market price.
Purely Competitive Market
A market structure characterized by a large number of small firms, a homogeneous product, perfect information, and ease of entry and exit, leading to price-taking behavior.
Barriers to Entry
Factors that prevent or impede the ability of a new competitor to enter an industry and compete with existing firms.
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