Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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![### Understanding Price Elasticity of Demand with the Midpoint Method
#### Graph Explanation
The graph presented shows two demand curves, D₁ (blue) and D₂ (red), and illustrates a method to compute the price elasticity of demand using the midpoint (arc) method. Let's break down the components:
- **Axes:**
- The vertical axis (P) represents the price level.
- The horizontal axis (Q) represents the quantity demanded.
- **Points and Lines:**
- Point A and Point C are the points of interest on demand curve D₁.
- Point A is where price \( P \) is $5 and quantity demanded \( Q \) is 100 units.
- Point B (located on the curve at intersection of $10 and quantity) corresponds to a point where price \( P \) is $10 and quantity demanded \( Q \) is 80 units.
- Point C is a projection of Point B on demand curve D₁.
Points A and C are used to apply the midpoint method:
#### Calculation Setup
To apply the midpoint method:
1. **Determine the Midpoints:**
\( P_{mid} \) = \(\frac{\$10 + \$5}{2}\) = \$7.50
\( Q_{mid} \) = \(\frac{100 + 80}{2}\) = 90 units
2. **Calculate Percentage Change in Quantity:**
\[\% \Delta Q = \frac{Q_2 - Q_1}{\left(\frac{Q_2 + Q_1}{2}\right)} \times 100\]
Where,
- \( Q_1 = 100 \) (initial quantity at \( P = \$5 \))
- \( Q_2 = 80 \) (new quantity at \( P = \$10 \))
Now calculate:
\[\% \Delta Q = \frac{80 - 100}{90} \times 100 = \frac{-20}{90} \times 100 \approx -22.22\%\]
#### Demand Line
To summarize, the graph provides a visual representation of the initial and new quantities and prices. The percent change in quantity is approximately -22.22%. Students are encouraged to apply this method further to compute the price elasticity using the percent change in price.
Ready to apply what you have learned? Calculate the](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd3b445b4-cac0-4f0d-9c18-1a4527eab73b%2Ff5e566d0-d17c-44e7-89b9-2a1c4ca06178%2Fopgup78_processed.png&w=3840&q=75)
Transcribed Image Text:### Understanding Price Elasticity of Demand with the Midpoint Method
#### Graph Explanation
The graph presented shows two demand curves, D₁ (blue) and D₂ (red), and illustrates a method to compute the price elasticity of demand using the midpoint (arc) method. Let's break down the components:
- **Axes:**
- The vertical axis (P) represents the price level.
- The horizontal axis (Q) represents the quantity demanded.
- **Points and Lines:**
- Point A and Point C are the points of interest on demand curve D₁.
- Point A is where price \( P \) is $5 and quantity demanded \( Q \) is 100 units.
- Point B (located on the curve at intersection of $10 and quantity) corresponds to a point where price \( P \) is $10 and quantity demanded \( Q \) is 80 units.
- Point C is a projection of Point B on demand curve D₁.
Points A and C are used to apply the midpoint method:
#### Calculation Setup
To apply the midpoint method:
1. **Determine the Midpoints:**
\( P_{mid} \) = \(\frac{\$10 + \$5}{2}\) = \$7.50
\( Q_{mid} \) = \(\frac{100 + 80}{2}\) = 90 units
2. **Calculate Percentage Change in Quantity:**
\[\% \Delta Q = \frac{Q_2 - Q_1}{\left(\frac{Q_2 + Q_1}{2}\right)} \times 100\]
Where,
- \( Q_1 = 100 \) (initial quantity at \( P = \$5 \))
- \( Q_2 = 80 \) (new quantity at \( P = \$10 \))
Now calculate:
\[\% \Delta Q = \frac{80 - 100}{90} \times 100 = \frac{-20}{90} \times 100 \approx -22.22\%\]
#### Demand Line
To summarize, the graph provides a visual representation of the initial and new quantities and prices. The percent change in quantity is approximately -22.22%. Students are encouraged to apply this method further to compute the price elasticity using the percent change in price.
Ready to apply what you have learned? Calculate the
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