Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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![### How to Compute Price Elasticity Using the Endpoint Method on \( D_1 \)
#### Graphical Analysis
The graph provided shows the following elements:
- Two demand curves, \( D_1 \) (blue) and \( D_2 \) (red).
- The price (\( P \)) is plotted on the vertical axis, and the quantity (\( Q \)) is plotted on the horizontal axis.
- Points \( A \), \( B \), and \( C \) are marked on the graph:
- Point \( B \) is at a price of $10 and a quantity of 80.
- Point \( A \) is at a price of $5 and a quantity of 100.
- Point \( C \) marks an intersection on the demand curve \( D_1 \).
### Problem Statement
Use the endpoint method to compute the price elasticity on \( D_1 \).
### Steps to Calculate Price Elasticity
1. **Identify the Points:**
- Initial Point (Point \( B \)): \( (Q_1, P_1) = (80, $10) \)
- Final Point (Point \( A \)): \( (Q_2, P_2) = (100, $5) \)
2. **Calculate the Percentage Change in Quantity (\( \Delta Q \)) using the Midpoint Formula:**
\[
\Delta Q = \frac{Q_2 - Q_1}{(Q_2 + Q_1) / 2}
\]
\[
\Delta Q = \frac{100 - 80}{(100 + 80) / 2}
\]
\[
\Delta Q = \frac{20}{90} = 0.222 \, \text{or} \, 22.2\%
\]
3. **Calculate the Percentage Change in Price (\( \Delta P \)) using the Midpoint Formula:**
\[
\Delta P = \frac{P_2 - P_1}{(P_2 + P_1) / 2}
\]
\[
\Delta P = \frac{5 - 10}{(5 + 10) / 2}
\]
\[
\Delta P = \frac{-5}{7.5} = -0.667 \, \text](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd3b445b4-cac0-4f0d-9c18-1a4527eab73b%2F199e860d-d998-4113-9d98-7345ba386b9a%2Fcx6bvcm_processed.png&w=3840&q=75)
Transcribed Image Text:### How to Compute Price Elasticity Using the Endpoint Method on \( D_1 \)
#### Graphical Analysis
The graph provided shows the following elements:
- Two demand curves, \( D_1 \) (blue) and \( D_2 \) (red).
- The price (\( P \)) is plotted on the vertical axis, and the quantity (\( Q \)) is plotted on the horizontal axis.
- Points \( A \), \( B \), and \( C \) are marked on the graph:
- Point \( B \) is at a price of $10 and a quantity of 80.
- Point \( A \) is at a price of $5 and a quantity of 100.
- Point \( C \) marks an intersection on the demand curve \( D_1 \).
### Problem Statement
Use the endpoint method to compute the price elasticity on \( D_1 \).
### Steps to Calculate Price Elasticity
1. **Identify the Points:**
- Initial Point (Point \( B \)): \( (Q_1, P_1) = (80, $10) \)
- Final Point (Point \( A \)): \( (Q_2, P_2) = (100, $5) \)
2. **Calculate the Percentage Change in Quantity (\( \Delta Q \)) using the Midpoint Formula:**
\[
\Delta Q = \frac{Q_2 - Q_1}{(Q_2 + Q_1) / 2}
\]
\[
\Delta Q = \frac{100 - 80}{(100 + 80) / 2}
\]
\[
\Delta Q = \frac{20}{90} = 0.222 \, \text{or} \, 22.2\%
\]
3. **Calculate the Percentage Change in Price (\( \Delta P \)) using the Midpoint Formula:**
\[
\Delta P = \frac{P_2 - P_1}{(P_2 + P_1) / 2}
\]
\[
\Delta P = \frac{5 - 10}{(5 + 10) / 2}
\]
\[
\Delta P = \frac{-5}{7.5} = -0.667 \, \text
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