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Why are macrophages, monocytes, mast cells, and dendritic cells considered "professional" antigen-presenting cells, whereas fibroblasts are considered "nonprofessional" antigen-presenting cells?
Oligopoly
A market structure dominated by a small number of large firms, leading to competitive and cooperative behavior among companies.
Pure Monopoly
A market structure where a single company or entity exclusively produces and sells a product or service, with no close substitutes.
Four-Firm Concentration Ratio
A metric indicating the total market share controlled by the four largest firms within an industry, used to assess market competitiveness.
Herfindahl Index
A measure of the concentration of market power held by the largest firms within an industry.
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