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Khan Academy
Khan Academy: The Effects of Govt Intervention in Different Market Structures
Practice what you've learned about options available to regulate markets where the socially optimal quantity is not produced.
Sophia Learning
Sophia: Monopoly
Through a series of resources, this tutorial investigates the characteristics of a monopoly and how to draw a cost analysis graph. Video lessons are provided to reinforce the concept.
Other
Oecd: Glossary of Statistical Terms: Monopolistic Competition
This site provides a simple and easy-to-understand definition of monopolistic competition.