The four-firm concentration ratio of the aircraft industry is over 80 percent.Most economists would consider this industry an oligopoly.

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A four-firm concentration ratio (CR4) of over 80% indicates that four companies account for the majority of the market share in the aircraft industry. This level of market concentration is typically found in an oligopoly market structure, where a small number of firms dominate the industry. Therefore, most economists would consider the aircraft industry an oligopoly.

The Four-Firm Concentration Ratio of the Aircraft Industry Is Over