Q: Suppose a factory emits pollution as a byproduct of production. The market equilibrium occurs where demand equals supply. Which equation represents the socially optimal supply curve?

$$MSC: \text{Marginal Private Cost (MPC)} + \text{Marginal External Cost (MEC)}$$

Question 1

Which of the following best describes a negative externality?

Accepted Answer

A cost imposed on a third party not reflected in market prices.

Question 2

Suppose a factory emits pollution as a byproduct of production. The market equilibrium occurs where demand equals supply. Which equation represents the socially optimal supply curve?

Accepted Answer

$$MSC: 	ext{Marginal Private Cost (MPC)} + 	ext{Marginal External Cost (MEC)}$$

Question 3

A government wants to correct a negative externality from electricity production. Which policy would most directly internalize the externality?

Accepted Answer

Imposing a Pigouvian tax equal to the marginal external cost.

Question 4

Which of the following is an example of a positive externality?

Accepted Answer

Vaccination reducing disease transmission.

Question 5

If the marginal social benefit (MSB) of education exceeds the marginal private benefit (MPB), what is the likely market outcome?

Accepted Answer

The market will provide less education than is socially optimal.

Question 6

According to the Coase Theorem, under what condition will private bargaining lead to an efficient outcome in the presence of externalities?

Accepted Answer

When transaction costs are low and property rights are well-defined.

Question 7

Which of the following best describes a public good?

Accepted Answer

A good that is both non-rivalrous and non-excludable.

Question 8

Why do public goods often lead to the free-rider problem?

Accepted Answer

Because people can benefit without paying for them.

Question 9

Which of the following is a real-world example of a common pool resource?

Accepted Answer

Fish in a public lake.

Question 10

Suppose the government implements a cap-and-trade system for carbon emissions. What is the main advantage of this system over direct regulation?

Accepted Answer

It allows firms with lower abatement costs to sell permits to those with higher costs, achieving the cap at lowest total cost.

Question 11

If a good is non-rivalrous but excludable, which category does it fall into?

Accepted Answer

Club good

Question 12

Which equation correctly represents the marginal social cost (MSC) in the presence of a negative externality?

Accepted Answer

$$MSC = MPC + MEC$$

Question 13

A city government wants to encourage more people to get vaccinated. Which policy would best address the positive externality?

Accepted Answer

Provide a subsidy for vaccinations.

Question 14

In the context of public goods, what does vertical summation of demand curves mean?

Accepted Answer

Adding up the willingness to pay of all individuals for each quantity.

Question 15

Which of the following is NOT a solution to the tragedy of the commons?

Accepted Answer

Allowing unrestricted access to the resource.

Question 16

Suppose the marginal external benefit (MEB) of a good is $$10$$ and the marginal private benefit (MPB) is $$30. $$What is the marginal social benefit (MSB)?

Accepted Answer

$$MSB = 40$$

Question 17

Why might Pigouvian taxes be difficult to implement in practice?

Accepted Answer

Because it is hard to measure the exact marginal external cost.

Question 18

Which of the following statements about government intervention in externalities is correct?

Accepted Answer

The goal is to achieve the socially optimal level of the externality, not necessarily zero.

Question 19

Which of the following is an example of a market-based policy to address externalities?

Accepted Answer

Pigouvian taxes and subsidies.

Question 20

If a common pool resource is overused, what is the likely outcome?

Accepted Answer

The resource will be depleted due to lack of ownership and overconsumption.

Externalities, Public Goods, and the Tragedy of the Commons: Microeconomics Study Guide

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