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# Notes on Market Structures The document appears to be notes on imperfect market structures. The handwritten text includes various terms and concepts related to market analysis, such as monopolies, oligopolies, and imperfect competition. There's also discussion of factors influencing market powe...

# Notes on Market Structures The document appears to be notes on imperfect market structures. The handwritten text includes various terms and concepts related to market analysis, such as monopolies, oligopolies, and imperfect competition. There's also discussion of factors influencing market power, including barriers to entry and possible cartels. **Key Concepts:** * **Imperfect Competition:** The notes emphasize that many real-world markets aren't perfectly competitive. * **Market Power:** Firms in imperfect markets can influence prices. * **Monopolies:** A single firm controls the market. * **Oligopolies:** A few large firms dominate the market. * **Barriers to Entry:** Obstacles that prevent new firms from entering the market. * **Externalities:** Costs or benefits imposed on third parties not directly involved in a market transaction * **Collective Goods:** Goods that are non-excludable and non-rivalrous. * **Information Asymmetry:** One party having more information than another. * **Interdependence:** The actions of one firm can affect the profits of others in an oligopoly. The document specifically mentions "ententes cartels". A diagram, though not precisely drawn, suggests an interplay between various market structures: monoply, oligopoly and some intermediary cases (not entirely clear which). **Additional Information:** The notes reference a sorority/fraternity context, chapters, and steps. These elements (steps 1, 2, 3), might refer to a course or project. **Language:** The language appears to be French. **Overall:** The notes are a compilation of theory and concepts likely from a business or economics course. There seem to be several ideas discussed, but the exact purpose and application to a specific case are not clear.