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Principles of Economics

Gregory Mankiw

Chapter 5

Elasticity and Its Application - all with Video Answers

Educators

Chapter Questions

01:50

Problem 1

For each of the following pairs of goods, which good
would you expect to have more elastic demand and
why?
a. required textbooks or mystery novels
b. Adele recordings or pop music recordings in
general
c. subway rides during the next six months or
subway rides during the next five years
d. root beer or water

Nick Johnson
Nick Johnson
Numerade Educator
06:35

Problem 2

Suppose that business travelers and vacationers have the following demand for airline tickets from Chicago to Miami:
$$
\begin{array}{ccc}
\text { Price } & \begin{array}{c}
\text { Quantity Demanded } \\
\text { (business travelers) }
\end{array} & \begin{array}{c}
\text { Quantity Demanded } \\
\text { (vacationers) }
\end{array} \\
\hline \$ 150 & 2,100 \text { tickets } & 1,000 \text { tickets } \\
200 & 2,000 & 800 \\
250 & 1,900 & 600 \\
300 & 1,800 & 400
\end{array}
$$
a. As the price of tickets rises from $\$ 200$ to $\$ 250$, what is the price elasticity of demand for
(i) business travelers and (ii) vacationers? (Use the midpoint method in your calculations.)
b. Why might vacationers and business travelers have different elasticities?

Oluwadamilola Ameobi
Oluwadamilola Ameobi
Numerade Educator
02:01

Problem 3

Suppose the price elasticity of demand for heating oil is 0.2 in the short run and 0.7 in the long run.
If the price of heating oil rises from $\$ 1.80$ to $\$ 2.20$ per gallon, what happens to the quantity of heating oil demanded in the short run? In the long run? (Use the midpoint method in your calculations.)
b. Why might this elasticity depend on the time horizon?

Anand Jangid
Anand Jangid
Numerade Educator
04:12

Problem 4

A price change causes the quantity demanded of a good to decrease by 30 percent, while the total revenue of that good increases by 15 percent. Is the demand curve elastic or inelastic? Explain.

ED
Ethan Dee
Numerade Educator
03:46

Problem 5

Cups of coffee and donuts are complements. Both have inelastic demand. A hurricane destroys half the coffee bean crop. Use appropriately labeled diagrams to answer the following questions.
a. What happens to the price of coffee beans?
b. What happens to the price of a cup of coffee? What happens to total expenditure on cups of coffee?
c. What happens to the price of donuts? What happens to total expenditure on donuts?

Kaylee Mcclellan
Kaylee Mcclellan
Numerade Educator
04:23

Problem 6

The price of aspirin rose sharply last month, while the quantity sold remained the same. Five people suggest various diagnoses of the phenomenon:
MEREDTTH: Demand increased, but supply was perfectly inelastic. ALEX: Demand increased, but it was perfectly inelastic. MrranDA: Demand increased, but supply decreased at the same time.
RICHARD: Supply decreased, but demand was unit elastic.
OwEN: Supply decreased, but demand was perfectly inelastic.
Who could possibly be right? Use graphs to explain your answer.

Natalie Britton
Natalie Britton
Numerade Educator
07:30

Problem 7

Suppose that your demand schedule for pizza is as follows:
$$
\begin{array}{ccc}
& \text { Quantity Demanded } & \text { Quantity Demanded } \\
\text { Price } & \text { (income }=\$ 20,000) & \text { (income }=\$ 24,000) \\
\hline \$ 8 & 40 \text { pizzas } & 50 \text { pizzas } \\
10 & 32 & 45 \\
12 & 24 & 30 \\
14 & 16 & 20 \\
16 & 8 & 12
\end{array}
$$
a. Use the midpoint method to calculate your price elasticity of demand as the price of pizza increases from $\$ 8$ to $\$ 10$ if (i) your income is $\$ 20,000$ and
(ii) your income is $\$ 24,000$.
b. Calculate your income elasticity of demand as your income increases from $\$ 20,000$ to $\$ 24,000$ if
(i) the price is $\$ 12$ and (ii) the price is $\$ 16$.

Kaylee Mcclellan
Kaylee Mcclellan
Numerade Educator
01:43

Problem 8

The New York Times reported (Feb. 17,1996 ) that subway ridership declined after a fare increase:
"There were nearly four million fewer riders in December 1995 , the first full month after the price of a token increased 25 cents to $\$ 1.50$, than in the previous December, a 4.3 percent decline."
a. Use these data to estimate the price elasticity of demand for subway rides.
b. According to your estimate, what happens to the Transit Authority's revenue when the fare rises?
C. Why might your estimate of the elasticity be unreliable?

EA
Erwin Antoni
Numerade Educator
02:18

Problem 9

Two drivers, Walt and Jessie, each drive up to a
gas station. Before looking at the price, each places
an order. Walt says, “I’d like 10 gallons of gas.”
Jessie says, “I’d like $10 worth of gas.” What is each
driver’s price elasticity of demand?

ST
Sounak Thakur
Numerade Educator
02:59

Problem 10

Consider public policy aimed at smoking.
a. Studies indicate that the price elasticity of demand for cigarettes is about $0.4 .$ If a pack of cigarettes currently costs $\$ 5$ and the government wants to reduce smoking by 20 percent, by how much should it increase the price?
b. If the government permanently increases the price of cigarettes, will the policy have a larger effect on smoking one year from now or five years from now?
c. Studies also find that teenagers have a higher price elasticity of demand than adults. Why might

Kaylee Mcclellan
Kaylee Mcclellan
Numerade Educator
01:10

Problem 11

You are the curator of a museum. The museum is running short of funds, so you would like to increase revenue. Should you increase or decrease the price of admission? Explain.

ED
Ethan Dee
Numerade Educator
02:44

Problem 12

Explain why the following might be true: A drought around the world raises the total revenue that farmers receive from the sale of grain, but a drought only in Kansas reduces the total revenue that Kansas farmers receive.

ED
Ethan Dee
Numerade Educator