Consider the diagram below representing a market with an externality. What is the social surplus when the quantity is 7 as a result of a large subsidy? 10 MSC S/ MPC 7 6 4 3 D/MB 1 1 4 6. 7 8. 10 Q

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### Diagram Analysis: Market with an Externality

The diagram represents a market affected by externalities and illustrates the impact of a large subsidy. It includes the following elements:

- **Axes**:
  - The vertical axis (P) represents the price level, ranging from 0 to 10.
  - The horizontal axis (Q) represents the quantity, ranging from 0 to 10.

- **Curves**:
  - **MSC (Marginal Social Cost)**: This curve is upward sloping, indicating the cost to society of producing an additional unit. It intersects with the vertical axis at approximately P = 5.
  - **S/MPC (Supply/Marginal Private Cost)**: This upward-sloping curve represents the private cost of production without considering externalities. It is less steep than MSC and also intersects the vertical axis at approximately P = 5.
  - **D/MB (Demand/Marginal Benefit)**: This downward-sloping curve represents the benefit to consumers from consuming an additional unit. It intersects the horizontal axis at Q = 9.

- **Intersection Points**:
  - **Socially Optimal Point**: Where MSC intersects D/MB around P = 6 and Q = 5.
  - **Market Equilibrium without Externalities**: Where S/MPC intersects D/MB around P = 4.5 and Q = 7.

### Problem Statement

The diagram queries about the social surplus when the quantity is 7 due to a large subsidy.

### Interpretation

- At a quantity of 7, the large subsidy presumably shifts the quantity to this level, increasing production beyond the socially optimal point.
- Social surplus can be analyzed by considering the area between the demand curve and the MSC up to the quantity of 7. 

This representation helps in understanding how subsidies can lead to overproduction in the presence of externalities and impact social welfare.
Transcribed Image Text:### Diagram Analysis: Market with an Externality The diagram represents a market affected by externalities and illustrates the impact of a large subsidy. It includes the following elements: - **Axes**: - The vertical axis (P) represents the price level, ranging from 0 to 10. - The horizontal axis (Q) represents the quantity, ranging from 0 to 10. - **Curves**: - **MSC (Marginal Social Cost)**: This curve is upward sloping, indicating the cost to society of producing an additional unit. It intersects with the vertical axis at approximately P = 5. - **S/MPC (Supply/Marginal Private Cost)**: This upward-sloping curve represents the private cost of production without considering externalities. It is less steep than MSC and also intersects the vertical axis at approximately P = 5. - **D/MB (Demand/Marginal Benefit)**: This downward-sloping curve represents the benefit to consumers from consuming an additional unit. It intersects the horizontal axis at Q = 9. - **Intersection Points**: - **Socially Optimal Point**: Where MSC intersects D/MB around P = 6 and Q = 5. - **Market Equilibrium without Externalities**: Where S/MPC intersects D/MB around P = 4.5 and Q = 7. ### Problem Statement The diagram queries about the social surplus when the quantity is 7 due to a large subsidy. ### Interpretation - At a quantity of 7, the large subsidy presumably shifts the quantity to this level, increasing production beyond the socially optimal point. - Social surplus can be analyzed by considering the area between the demand curve and the MSC up to the quantity of 7. This representation helps in understanding how subsidies can lead to overproduction in the presence of externalities and impact social welfare.
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