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To solve the problem, we need to calculate the consumer surplus, which is the difference between what buyers are willing to pay and the actual price of the product (in this case, $18 per piece of cake).

### Given:
- **Willingness to pay (WTP)** of buyers:
  - Buyer 1: $11
  - Buyer 2: $13
  - Buyer 3: $15
  - Buyer 4: $16
  - Buyer 5: $18
  - Buyer 6: $20
  - Buyer 7: $22
- **Price of cake** = $18

### Steps:
1. Buyers who are willing to pay less than $18 (Buyers 1, 2, 3, 4) will not buy the cake, so their consumer surplus is $0.
2. Buyers who are willing to pay **more than $18** (Buyers 6 and 7) will get the cake and experience consumer surplus.
3. **Consumer surplus** is calculated as the difference between what they are willing to pay and the actual price, summed for all buyers who purchase.

### Calculation:
- Buyer 6: Willing to pay $20, price is $18. Consumer surplus = $20 - $18 = $2.
- Buyer 7: Willing to pay $22, price is $18. Consumer surplus = $22 - $18 = $4.

### Total consumer surplus = $2 + $4 = **$6**.

Thus, the consumer surplus is **6 dollars**.

Would you like further details on the calculation or have any questions?

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Here are 5 related questions:
1. What is producer surplus, and how is it different from consumer surplus?
2. How would the consumer surplus change if the price of the cake was $15 instead of $18?
3. What factors can cause a change in the willingness to pay of buyers in a real market?
4. How does consumer surplus affect overall market efficiency?
5. How would you calculate the consumer surplus if the price was dynamic for each buyer?

**Tip:** Consumer surplus is higher when the actual price is lower than what consumers are willing to pay, allowing them to gain value from the transaction.

Suppose there are 7 potential buyers in the market for cake, and their willingness to pay for a piece of cake is listed. Calculate the consumer surplus if the price of the cake is $18 per piece.

Learn how to calculate the consumer surplus for a market with 7 buyers. Each buyer has a different willingness to pay for a piece of cake, and the market price is $18. This problem demonstrates key concepts such as consumer surplus, willingness to pay, and market equilibrium.

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