Boeing and Airbus together supply virtually all large commercial aircraft to the global aviation market. When Boeing considers pricing its 787, it cannot ignore Airbus's A350 — any Boeing pricing decision that gains share comes at Airbus's expense, and Airbus will respond. When Boeing's costs rise, it cannot simply pass through the full increase if Airbus will hold price steady and take customers. This constant mutual watching and reacting — strategic interdependence — is the defining feature of oligopoly, and it makes oligopoly markets fundamentally different from the competitive or monopoly extremes.
In plain terms
An oligopoly is a market structure with a small number of dominant firms (typically 2–10) that together supply a large share of the market. Three defining features:
- Few sellers: each firm is large enough that its decisions visibly affect market outcomes — output, price, and market share.
- High barriers to entry: scale requirements, capital costs, brand investment, or regulation prevent easy entry. The few firms maintain their position because challengers cannot easily replicate it.
- Strategic interdependence: each firm must factor in rival responses when making decisions. A price cut by one firm will likely be matched by competitors; a price increase may not. Output expansion reduces the market price for all firms.
Oligopoly cannot be analyzed with simple supply-demand tools — outcomes depend on assumptions about how firms respond to each other, which is why game theory is the natural analytical framework.
Why it works this way
The kinked demand model offers one explanation for price rigidity in oligopolies. If a firm raises price, rivals don't follow — the firm loses customers rapidly (elastic demand above the current price). If the firm cuts price, rivals match the cut to protect their share — the firm gains little volume (inelastic demand below the current price). The resulting asymmetric demand curve creates a kink at the current price, with a range of marginal costs over which no price change is profitable. Prices tend to be sticky in oligopolies for this reason.
Price leadership is another common pattern: the dominant firm sets price, and smaller rivals follow to avoid a price war. The Bureau of Economic Analysis industry data shows that highly concentrated industries — petroleum refining, telecommunications, commercial aviation — display price movements consistent with coordinated leadership rather than independent competitive pricing.
A real example
U.S. commercial aviation post-deregulation approximates oligopoly. After consolidation (Delta-Northwest, United-Continental, American-US Airways), four airlines control about 80 percent of domestic capacity. The Bureau of Transportation Statistics fare data shows fare patterns on routes with two or three carriers versus routes with one carrier — competitive routes have lower fares, but the oligopolistic coordination observed through aligned capacity decisions and parallel fare increases is well-documented.
Why it matters
Oligopoly is the dominant market structure in capital-intensive industries — automotive, aerospace, pharmaceuticals, telecommunications, financial services, and energy. Understanding how firms in these markets make pricing and output decisions requires understanding strategic interdependence — which is why game theory is essential to modern industrial economics.
