a) The inverse demand function for taxi-apps is estimated to be p = 100-2Q. If the price increases from 20 to 30, then by how much does consumer surplus change?
a) The inverse demand function for taxi-apps is estimated to be p = 100-2Q. If the price increases from 20 to 30, then by how much does consumer surplus change?
Chapter1: Making Economics Decisions
Section: Chapter Questions
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![(a) The inverse demand function for taxi-apps is estimated to be \( p = 100 - 2Q \). If the price increases from 20 to 30, then by how much does consumer surplus change?
### Explanation:
To determine the change in consumer surplus when the price changes, we need to calculate the consumer surplus at both prices and find the difference.
1. **Consumer Surplus at \( p = 20 \):**
- Solve for \( Q \) when \( p = 20 \):
\[
20 = 100 - 2Q \implies 2Q = 80 \implies Q = 40
\]
- Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 40 \):
- Height of the triangle: \( 100 - 20 = 80 \)
- Base of the triangle: \( Q = 40 \)
- Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 40 \times 80 = 1600 \)
2. **Consumer Surplus at \( p = 30 \):**
- Solve for \( Q \) when \( p = 30 \):
\[
30 = 100 - 2Q \implies 2Q = 70 \implies Q = 35
\]
- Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 35 \):
- Height of the triangle: \( 100 - 30 = 70 \)
- Base of the triangle: \( Q = 35 \)
- Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 35 \times 70 = 1225 \)
3. **Change in Consumer Surplus:**
- Change = Consumer Surplus at \( p = 30 \) - Consumer Surplus at \( p = 20 \)
- Change = \( 1225 - 1600 = -375 \)
Thus, the](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F78664e34-f555-4df8-8abc-44c0302d65c7%2F0c193805-cefa-4354-b2bb-d9127320d3ac%2Fto7xtig_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(a) The inverse demand function for taxi-apps is estimated to be \( p = 100 - 2Q \). If the price increases from 20 to 30, then by how much does consumer surplus change?
### Explanation:
To determine the change in consumer surplus when the price changes, we need to calculate the consumer surplus at both prices and find the difference.
1. **Consumer Surplus at \( p = 20 \):**
- Solve for \( Q \) when \( p = 20 \):
\[
20 = 100 - 2Q \implies 2Q = 80 \implies Q = 40
\]
- Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 40 \):
- Height of the triangle: \( 100 - 20 = 80 \)
- Base of the triangle: \( Q = 40 \)
- Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 40 \times 80 = 1600 \)
2. **Consumer Surplus at \( p = 30 \):**
- Solve for \( Q \) when \( p = 30 \):
\[
30 = 100 - 2Q \implies 2Q = 70 \implies Q = 35
\]
- Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 35 \):
- Height of the triangle: \( 100 - 30 = 70 \)
- Base of the triangle: \( Q = 35 \)
- Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 35 \times 70 = 1225 \)
3. **Change in Consumer Surplus:**
- Change = Consumer Surplus at \( p = 30 \) - Consumer Surplus at \( p = 20 \)
- Change = \( 1225 - 1600 = -375 \)
Thus, the
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