Practice problems(P’s and A’s):
Ch. 10: Externalities
1.
#8- Ringo loves playing rock-n-roll music at high volume. Luciano loves opera and hates
rock-n-roll. Unfortunately, they are next-door neighbors in an apartment building with paper-thin
walls.
a)
What is the externality here?
b) What command-and-control policy might the landlord impose? Could
such a policy lead to an inefficient outcome?
c)
Suppose the landlord lets tenants do whatever they want. According to
Coase theorem, how might Ringo and Luciano reach an efficient outcome on
their own? What might prevent them from reaching an efficient outcome?
Answers:
a)
The externality is the noise or music
b) The landlord would limit the time and amount of music being played. This would lead to
an inefficient outcome because the tenants are both losing.
c)
The two tenants would find an equal amount of time that each can play their respective
music and take turns playing. Regulation by the landlord would prevent them from finding this
equilibrium.
2.
FIRM
A
B
C
#12- There are three industrial firms in Happy Valley.
INITIAL POLLUTION LEVEL COST OF REDUCING
POLLUTION BY 1 UNIT
70 UNITS
$20
80 UNITS
$25
50 UNITS
$10
The government wants to reduce pollution to 120 units, so it gives each firm 40 tradable
pollution permits.
a) Who sells permits and how many do they sell? Who buys permits and how many do they
buy? Briefly explain why the sellers and buyers are each willing to do so. What is the total cost
of pollution reduction in this situation?
b) How much higher would the costs of pollution reduction be if the permits could not be
traded?
Answers:
a) Firm C sells permits because it has the lowest pollution level and the lowest cost to reduce;
Firm B would but permits because it has the highest pollution and highest cost to reduce; Total
cost is unknown for you would need to know the price of a permit, which is unknown.
b)
This is unknown because you need permit price to determine cost in the first place.
Ch. 11: Public Goods and Common Resources
1.
#1- Think about the goods and services provided by your local government.
a) Using the classification in Figure 1, explain which category each of the
following goods falls into:





Police Protection
Snow plowing
Education
Rural roads
City streets
b)
Why do you think the government provides items that are not public goods?
a)
.
Answers:





Police protection= Natural Monopoly
Snow plowing= Common Resource
Education= Public Good
Rural roads= Public Good
City streets= Common Resource
b) They provide non public goods to gain revenue and because not everyone
agrees with the government.
2.
#3- Charlie loves watching Teletubbies on his local public TV station, but he never sends
any money to support the station during its fundraising drives.
a)
What name do economists have for Charlie?
b)
How can the government solve the problem caused by people like Charlie?
c)
Can you think of ways the private market can solve this problem? How does
the existence of cable TV alter the situation?
Answers:
a)
Charlie is known as a Free Rider
b)
The government would need to privatize channels so viewers have to pay to view them.
c)
The private market could solve the problem through taxation. The tax revenue would be
used to support the TV station. The presence of cable alters this because cable has to be paid for.
Ch.12-The Design of the Tax System
1.
#10- Any income tax schedule embodies two types of tax rate: average tax rates and
marginal tax rates.
Proportional Tax
Income
Amount of Percent of
Tax
Income
$50,000 $12,500
25%
$100,000 $25,000
25%
$200,000 $50,000
25%
Regressive Tax
Amount of Percent of
Tax
Income
$15,000
30%
$25,000
25%
$40,000
20%
Progressive Tax
Amount of Percent of
Tax
Income
$10,000
20%
$25,000
25%
$60,000
30%
a) The average tax rate is defined as total taxes paid divided by income. Using
the proportional tax system in the table above, what are the average tax rates for
people earning $50,000, $100,000, and $200,000? What are the corresponding
average tax rates in the regressive and progressive tax systems?
b) The marginal tax rate is defined as the extra taxes paid on additional income
divided by the increase in income. Calculate the marginal tax rate for the
proportional tax system as income rises from $50,000 to $100,000. Calculate the
marginal tax rate as income rises from $100,000 to $200,000. Calculate the
corresponding marginal tax rates for the regressive and progressive tax systems.
c)
Describe the relationship between average tax rates and marginal tax rates for
each of these three systems. In general, which rate is relevant for someone deciding
whether to accept a job that pays slightly more than their current job? Which rate is
relevant for judging the vertical equity of a tax system?
Answers:
a) Proportional- $50,000=25%, $100,000=25%, $200,000=25%; Regressive- 30%, 25%,
20%; Progressive- 20%, 25%, 30%
b) Proportional- $50,000 to $100,000= 25%, $100,000 to $200,000= 25%; Regressive- 20%,
15%; Progressive- 30%, 35%
c)
For the middle incomes, Average and Marginal tax rates are the same; The marginal tax
rate is most relevant for this situation; The average tax rate is most relevant for judging vertical
equity.
2.
#7- Suppose that your state raises its sales tax from 5 percent to 6 percent. The state
revenue commissioner forecasts a 20 percent increase in sales tax revenue. Is this plausible?
Explain.
Answers:
This is not plausible. It is impossible that a 1% increase of taxation won’t increase revenue by
20%.