Oligopoly theory makes heavy use of game theory to model the behavior of oligopolies:
- Stackelberg's duopoly. In this model the firms move sequentially (see Stackelberg competition).
- Cournot's duopoly. In this model the firms simultaneously choose quantities (see Cournot competition).
- Bertrand's oligopoly. In this model the firms simultaneously choose prices (see Bertrand competition).
- Monopolistic competition. A market structure in which several or many sellers each produce similar, but slightly differentiated products. Each producer can set its price and quantity without affecting the marketplace as a whole.


