Use the endpoint method to compute the price elasticity on D1. $10 в $5 A D D2 80 90 100 From point B to point A, the price elasticity: P.

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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
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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