Warm up
| | Number of firms | Market power | Level of differentiation | Barriers to entry | Examples |
| Perfect composition | Infinite | none | Homogenous | No | Agricultural |
| Monopolistic competition | many | small | Lots- differentiate | Small | Clothing |
| oligopoly | 3-4 (70 %) | Quite large | Maybe- homogenous or heterogeneous products | Very hard | Oil/cereal |
| monopoly | 1 | 100% | None | Virtually impossible | EDF (Energy of france) |
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