Chapter 7/Consumers, Producers, and the Efficiency of Markets ❖ 17
66. Suppose Brent, Callie, and Danielle each purchase a particular type of electric pencil sharpener at a price of
$20. Brent’s willingness to pay was $22, Callie’s willingness to pay was $25, and Danielle’s willingness to pay
was $30. Which of the following statements is correct?
Had the price of the pencil sharpener been $24 rather than $20, only Danielle would have been a
buyer.
Brent’s consumer surplus is the smallest of the three individual consumer surpluses.
For the three individuals together, consumer surplus amounts to $60.
The fact that all three individuals paid $20 for the same type of pencil sharpener indicates that each
one placed the same value on that pencil sharpener.
67. Suppose Katie, Kendra, and Kristen each purchase a particular type of cell phone at a price of $80. Katie’s
willingness to pay was $100, Kendra’s willingness to pay was $95, and Kristen’s willingness to pay was $80.
Which of the following statements is correct?
For the three individuals together, consumer surplus amounts to $35.
Having bought the cell phone, Kristen is better off than she would have been had she not bought it.
Had the price of the cell phone been $95 rather than $80, Katie and Kendra definitely would have
been buyers and Kristen definitely would not have been a buyer.
The fact that all three individuals paid $80 for the same type of cell phone indicates that each one
placed the same value on that cell phone.
68. Sarah buys a new MP3 player for $135. She receives consumer surplus of $25 on her purchase if her willing-
ness to pay is
69. Abraham drinks Mountain Dew. He can buy as many cans of Mountain Dew as he wishes at a price of $0.55
per can. On a particular day, he is willing to pay $0.95 for the first can, $0.80 for the second can, $0.60 for the
third can, and $0.40 for the fourth can. Assume Abraham is rational in deciding how many cans to buy. His
consumer surplus is