Which of the following best defines an externality according to the provided text?
Consider whether the impact involves a financial transaction between the actor and the affected party.
This aligns with the fundamental definition where the effect on a third party is uncompensated.
This describes market power, which is a different form of market failure than externalities.
These are private costs, whereas externalities involve uncompensated impacts on parties outside the transaction.
This refers to equity-based policies rather than the efficiency-based correction of externalities.
Question 2/ 20
In the presence of a negative externality, such as pollution from steel production, how does the social cost compare to the private cost?
Recall how the 'social cost' curve is positioned relative to the 'private cost' (supply) curve in the text's diagrams.
The social cost curve incorporates both the internal production costs and the external damages imposed on society.
Negative externalities impose additional burdens on society, which increases the total cost above the private level.
Negative externalities shift the cost side of the market equation, not the value side.
A tax is a tool to align these costs, but the social cost itself is the sum of private and external impacts.
Question 3/ 20
How do positive externalities, such as education or technology spillovers, affect the market's equilibrium quantity?
Think about whether the 'private value' perceived by the consumer is higher or lower than the 'social value'.
Since buyers do not capture the full social value, they demand less than the socially optimal amount.
This outcome is characteristic of negative externalities, where external costs are ignored.
The invisible hand fails to reach efficiency when external benefits or costs are not reflected in market prices.
Positive externalities relate to the value to society, not necessarily an increase in the private cost of production.
Question 4/ 20
What does it mean for a government to 'internalize the externality'?
The term relates to making 'external' factors part of the 'internal' decision-making process.
By using taxes or subsidies, the government makes the external impact a private cost or benefit for the decision-maker.
Internalization involves using market mechanisms to reach an optimum, rather than outright prohibition.
Internalizing positive externalities typically involves providing a subsidy rather than just removing existing taxes.
Internalization seeks to correct the market's incentives while maintaining private ownership and operation.
Question 5/ 20
According to Mankiw, why is the market equilibrium inefficient when externalities are present?
Consider the incentives that individual buyers and sellers follow in a free market.
Market participants only respond to private costs and benefits, leading to a mismatch with social costs and benefits.
Price ceilings often create their own inefficiencies (shortages) and do not address the root cause of externalities.
Competition generally leads to efficiency; it is the absence of a price on external effects that causes the failure here.
Inefficiency arises from the lack of a price signal for the externality, not necessarily from a conscious choice to ignore information.
Question 6/ 20
On a supply and demand graph for a good with a negative externality, where is the socially optimal quantity located?
The social planner looks for the balance between social value and the total cost to society.
This point represents the quantity where the marginal benefit to consumers equals the marginal cost to society.
This intersection defines the market equilibrium, which ignores external costs.
Efficiency is determined by the balance of marginal costs and marginal benefits, not by minimizing costs alone.
Maximum distance between curves does not represent an equilibrium or an optimum in standard welfare analysis.
Question 7/ 20
What does the vertical distance between the supply curve and the social-cost curve represent on a graph?
Think about the components that make up the 'Social Cost'.
Since Social Cost = Private Cost + External Cost, the difference between the two curves is the external cost per unit.
Government revenue is represented by the area of a rectangle, not just a vertical distance.
Consumer surplus is the area below the demand curve and above the market price.
Deadweight loss is represented by a triangular area between the social cost and demand curves.
Question 8/ 20
In a graph depicting a positive externality, where does the social-value curve lie relative to the demand (private value) curve?
Does society as a whole value the good more or less than the individual purchaser?
Because the social value includes both the private benefit to the buyer and the benefit to bystanders.
A curve below the demand would imply that the activity is socially less valuable than it is to the individual buyer.
Positive externalities affect the benefit/value side of the market, not the production cost side.
Social value usually varies with the quantity produced, much like private value does.
Question 9/ 20
On a graph of a market with a negative externality, the area of the triangle between the demand curve and the social-cost curve (from Q_OPTIMUM to Q_MARKET) represents:
Consider the surplus lost by producing units where the cost to society is higher than the value to buyers.
This area shows the total loss in welfare because units are produced for which social cost exceeds private value.
The total external cost is represented by a parallelogram area between the supply and social-cost curves up to the quantity produced.
Producer profit (surplus) is the area above the supply curve and below the price received.
This specific triangular area represents lost efficiency, not a gain in consumer well-being.
Question 10/ 20
If a social planner wanted to achieve the optimal outcome in a market with a positive externality, they would look for the intersection of which two curves?
The planner wants to maximize total surplus using the full benefit to society.
Efficiency occurs where the total benefit to society of the last unit equals the cost of producing it.
This would mix individual benefits with social costs, which does not define the social optimum.
This intersection defines the market equilibrium, which is inefficient in the presence of externalities.
While technically correct if there were also a negative externality, the question focuses on the correction for a positive one using private supply.
Question 11/ 20
Suppose a factory emits pollution that costs society 50 per ton of steel produced. If the market equilibrium price is 200 and the equilibrium quantity is 1,000 tons, what is the ideal corrective tax to reach the social optimum?
Recall the relationship between the 'ideal corrective tax' and the 'external cost' mentioned in section 10-2b.
An ideal Pigouvian tax should exactly equal the external cost per unit to internalize the impact.
A tax of 150 would be the difference between price and cost, but the goal is to match the external damage (50).
This value incorrectly adds the tax to the market price rather than identifying the tax amount itself.
While this is the total external cost at the market equilibrium, the question asks for the per-unit tax rate.
Question 12/ 20
If the government imposes a corrective tax of $T on a market with a negative externality, the new supply curve (S2) will be represented by which equation?
A tax increases the cost of production for the seller at every quantity level.
A tax on sellers shifts the supply curve upward vertically by the exact size of the tax.
Subtracting T would represent a subsidy, which would encourage more of the negative externality.
This would shift the quantity supplied rightward, which is not what a tax on production does.
This represents a tax on buyers (shifting the demand curve down), which is equivalent in incidence but not the standard way to model a producer tax.
Question 13/ 20
A community has two power plants. Plant A can reduce a ton of pollution at a cost of 300, while Plant B can do it for 500. If the government wants to reduce total pollution by 2 tons at the lowest cost, it should:
Consider which plant can achieve the goal with fewer resources.
This tax would incentivize Plant A to reduce (since 300 < 301) but Plant B would pay the tax (since 500 > 301), which is efficient if only 1 ton was needed; however, to get 2 tons, the tax must be high enough to make Plant A reduce 2 tons.
This regulation is inefficient because it ignores the fact that Plant A can reduce pollution more cheaply than Plant B.
Subsidizing the high-cost reducer does not minimize the social cost of achieving the pollution reduction.
Price ceilings create shortages and do not provide a direct incentive to reduce pollution emissions.
Question 14/ 20
If the government auctions off 100 pollution permits and they sell for $20 each, what is the equivalent corrective tax per unit of pollution?
Look at Figure 4 and the surrounding text regarding the equivalence of taxes and permits.
The price of a permit in a market-based system acts exactly like a corrective tax of the same amount.
This is the total revenue raised, not the per-unit tax or permit price.
This incorrectly divides the number of permits by the price ($100/20).
The text explicitly states that pollution permits and corrective taxes are equivalent in their economic effects.
Question 15/ 20
According to the Coase theorem, private parties can solve the problem of externalities on their own if which condition is met?
Think about the obstacles that might prevent two neighbors from reaching an agreement.
The absence of transaction costs is the key requirement for private bargaining to reach an efficient outcome.
While property rights must be assigned, the Coase theorem suggests the outcome is efficient regardless of who receives the rights.
A large number of parties usually increases transaction costs, making a private solution less likely.
The theorem assumes parties act in their own self-interest through bargaining.
Question 16/ 20
Why do economists generally prefer corrective taxes over command-and-control regulations for reducing pollution?
Consider the flexibility a tax gives to different firms with different costs.
Taxes allow firms with the lowest abatement costs to reduce the most, achieving the target efficiently.
While enforcement is a factor, the primary economic argument is about the efficiency and cost-effectiveness of the reduction.
Neither policy typically seeks to eliminate pollution entirely, as the costs of doing so would outweigh the benefits.
Both can have welfare effects, but corrective taxes actually improve efficiency by moving the market toward the social optimum.
Question 17/ 20
In the example of Emily's dog Clifford and her neighbor Horace, the Coase theorem suggests that if the benefit of the dog to Emily is 500 and the cost of the barking to Horace is 700:
Compare the 'benefit' to the 'cost' and look for a mutually beneficial trade.
Since the cost to Horace exceeds the benefit to Emily, there is a range of payments where both parties are better off without the dog.
Even if Emily has the right, she would accept a payment that is higher than the value she places on keeping the dog.
The theorem argues that private bargaining can reach the efficient outcome without government mandate.
The theorem assumes transaction costs are zero or low enough to allow bargaining.
Question 18/ 20
Which of the following is a potential reason why private solutions to externalities, like the Coase theorem, often fail in the real world?
Consider the 'costs that parties incur during the process of agreeing' mentioned in section 10-3b.
High transaction costs prevent parties from reaching and enforcing the mutually beneficial agreements the theorem predicts.
Standard economic theory assumes rationality; failure is usually due to structural barriers like costs or information.
Poorly defined property rights are actually an obstacle; well-defined rights are a prerequisite for bargaining.
Externalities are a case where the invisible hand fails, necessitating either private bargaining or government action.
Question 19/ 20
Corrective taxes are unique compared to other taxes because they:
Recall the discussion in section 10-2b about how these taxes affect economic efficiency.
Most taxes create a wedge that reduces efficiency, but corrective taxes fix a pre-existing market failure.
Corrective taxes do raise revenue, which can be used to reduce other distorting taxes.
They are typically paid by the party generating the negative externality to discourage the behavior.
Corrective taxes address negative externalities; positive externalities are addressed with corrective subsidies.
Question 20/ 20
Industrial policy, such as government support for high-tech industries, is primarily justified by which economic concept?
Review the Case Study on 'Technology Spillovers' in section 10-1c.
If a firm's research benefits other firms without compensation, the government may subsidize it to reach the social optimum.
While preventing monopolies is a policy goal, 'industrial policy' specifically targets the expansion of certain sectors based on their external benefits.
The benefits principle relates to how taxes are collected, not why a specific industry is supported.
Industrial policy focuses on the positive external 'gains' of new knowledge, not the negative 'waste' of old goods.