An oligopoly with exactly two dominant firms is also called a:

1. Oligopoly means a small number of firms rather than any fixed count. 2. The Boeing and Airbus case is described as an oligopoly for large passenger aircraft. 3. It is also called a duopoly because just two firms dominate. 4. A monopoly would mean a single seller instead of two. _Source: OpenStax Principles of Microeconomics for AP(R) Courses 2e (CC BY 4.0), Ch 10 'Monopolistic Competition and Oligopoly', sections 10.1-10.2_