https://file.aiquickdraw.com/mathbot/file/1729477352468fogu3j1p.jpg

In this graph, we are asked to determine the consumer surplus at equilibrium. The concept of **consumer surplus** refers to the difference between what consumers are willing to pay for a good (indicated by the demand curve) and what they actually pay at the market price (the equilibrium price). It is represented by the area between the demand curve and the price level up to the equilibrium quantity.

Looking at the diagram:

- The equilibrium is where the supply and demand curves intersect at price **P2** and quantity **Q2**.
- The consumer surplus is the area above the price line **P2** but below the demand curve, from the origin to quantity **Q2**.

The area representing consumer surplus is the triangle **A + B + C**. These three regions together represent the difference between the higher prices consumers were willing to pay and the lower price they actually paid at equilibrium.

Thus, the correct answer is **B: A + B + C**.

Would you like more details or have any questions about this? 

Here are five related questions for further exploration:
1. How is consumer surplus affected by a shift in the demand curve?
2. What happens to consumer surplus when a price floor is introduced above equilibrium?
3. Can consumer surplus be negative? If yes, under what conditions?
4. How would producer surplus be represented on this graph?
5. How is consumer surplus calculated mathematically using integrals in continuous demand functions?

**Tip:** Remember, consumer surplus is often a triangle in basic supply-demand graphs and is calculated using the formula \(\frac{1}{2} \times \text{base} \times \text{height}\).

Refer to Figure 7-19. At equilibrium, consumer surplus is represented by the area.

Understand how to calculate consumer surplus from a supply and demand graph. This involves identifying equilibrium price and quantity, and applying the area formula for the triangle that represents consumer surplus.

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