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In the given graph, we are dealing with a market for metro cards, where a tax of $120 per card has been introduced. The new supply curve, labeled "S+Tax," has shifted upward by the tax amount from the original "Supply" curve. The demand curve, labeled as "D_M," remains unchanged.

You are asked to:

1. **Shade the tax revenue**: This can be represented as a rectangle. The tax revenue comes from the quantity of metro cards sold after the tax is implemented (where the new equilibrium between demand and "S+Tax" occurs). The height of the rectangle is the tax amount ($120), and the width is the quantity of metro cards sold at the new equilibrium price.

2. **Shade the deadweight loss**: This is the loss in economic efficiency due to the tax. It forms a triangle between the quantity of metro cards that would have been sold without the tax (intersection of original supply and demand) and the quantity sold after the tax (intersection of "S+Tax" and demand). The area of this triangle represents the deadweight loss.

### Key steps:
- **Tax Revenue**: Look at the distance between the new quantity sold (after-tax) and the height of $120. The width represents the post-tax quantity, and the height is the $120 tax.
- **Deadweight Loss**: This is the triangular area that forms due to the reduction in quantity sold. It represents the loss of consumer and producer surplus.

Would you like a detailed explanation of how to calculate these areas or further clarification on the graph?

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Here are 5 related questions to deepen understanding:
1. How does the introduction of the tax impact consumer surplus and producer surplus?
2. Why is deadweight loss an important concept when evaluating the effects of taxation?
3. How can you calculate the exact amount of tax revenue based on this graph?
4. What would happen to the deadweight loss if the tax were increased or decreased?
5. How would the demand curve affect the results if it were more elastic?

**Tip**: Deadweight loss is higher when demand or supply is more elastic, as this indicates a greater sensitivity to price changes.

Suppose the government taxes metro cards. The graph shows the annual supply and demand for this good, as well as the supply curve shifted up by the proposed tax ($120 per card). Shade the area that represents tax revenue and deadweight loss.

Explore the effects of a $120 tax per metro card on the supply and demand graph. Learn how to calculate tax revenue and deadweight loss, and understand their implications on the market. Suitable for high school economics students.

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