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Annenberg Foundation
Annenberg Learner: Economics U$a: 21st Century Edition
A micro and macroeconomics course for 21st century learners. 28 half-hour videos sessions with text and guides regarding markets, firms, supply and demand, perfect competition and inelastic demand, economic efficiency, monopolies,...
Robert Schenk, PhD
Cyber Economics: The Theory of Few Sellers
An overview of monopoly, oligopoly and duopoly, focusing on the interdependence of firms in an oligopoly, shown through the use of a game tree how these firms are tempted towards the practice of collusion.
Other
South Western Learning: Oligopoly/monopolistic Competition: Kinked Demand Curve
This South-Western College Publishing website describes a situation in which oligopolistic firms vie for competition among consumers.
Other
Elemental Economics: Review of Basic Definitions: Competition
This site provides a good description of the four types of market structures: perfect competition, monopolistic competition, oligopoly, and monopoly, along with the major characteristics of each.
Curated OER
The Prisoner's Dilemma and Duopoly
This site focuses on the interdependence of firms in an oligopoly, and shows through the use of a game tree how these firms are tempted towards the practice of collusion.