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According to the graph shown, total surplus is area:

Multiple Choice
A + B + C.
A.
A + B.
B.

To determine the total surplus according to the graph, we need to understand that total surplus is the sum of consumer surplus and producer surplus.

### Breakdown:
- **Consumer Surplus:** The area above the equilibrium price and below the demand curve (which is typically area \( A \)).
- **Producer Surplus:** The area below the equilibrium price and above the supply curve (which is typically area \( C \)).

Given the equilibrium price \( P^* = 6 \) and equilibrium quantity \( Q^* = 10 \):

- **Consumer Surplus** is represented by area **A**.
- **Producer Surplus** is represented by area **C**.

Therefore, the **Total Surplus** = Consumer Surplus + Producer Surplus = \( A + C \).

However, the option \( A + C \) is not listed. The correct interpretation from the options provided would be \( A + B + C \), where \( B \) is a part of both consumer and producer surplus. But considering that \( B \) is shared, it’s often better represented as \( A + C \).

Given the options:
- **\( A + B + C \)** seems the most correct as it includes the entire area up to the supply and demand curves.

So the correct answer would be:
**A + B + C.**

Would you like further details or have any questions?

Here are some related questions to deepen understanding:

1. What is the significance of consumer surplus in economic analysis?
2. How does a shift in the supply curve affect total surplus?
3. Can producer surplus exist in a perfectly competitive market at all times?
4. How does the equilibrium price ensure maximum total surplus?
5. What role does deadweight loss play in the context of total surplus?
6. How does taxation affect the areas of consumer and producer surplus?
7. Can you calculate the specific values of consumer and producer surplus with given coordinates?
8. How do price ceilings and floors affect total surplus?

**Tip:** Always ensure you clearly identify the equilibrium price and quantity when calculating areas of surplus on a graph.

Explore how to calculate total surplus in economics using a graphical representation. This detailed explanation covers consumer surplus, producer surplus, and their sum to determine total surplus. Suitable for higher education students and economic enthusiasts.

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