Which policy is an example of a market-based approach to externalities?

Which policy is an example of a market-based approach to externalities?

• A. Command-and-control regulation
• B. Voluntary industry guidelines
• C. Subsidies for pollution
• D. Emission taxes or cap-and-trade

Answer: (D)

Market-based policies use price signals to align private incentives with social costs. An emission tax imposes a cost on each unit of pollution, so firms reduce emissions until the marginal abatement cost equals the tax. Cap-and-trade creates a market for pollution permits; firms with low abatement costs can sell permits to those with higher costs, lowering total emissions to the cap. Because these approaches turn the externality into a price and let the market allocate abatement where it’s cheapest, they tend to achieve a more efficient outcome than rigid rules. In contrast, command-and-control regulation sets fixed limits or technology requirements, which can be inflexible and costly; voluntary guidelines lack enforcement, leading to uncertain results; subsidies for pollution encourage more pollution rather than reduce it.

Market-based policies use price signals to align private incentives with social costs. An emission tax imposes a cost on each unit of pollution, so firms reduce emissions until the marginal abatement cost equals the tax. Cap-and-trade creates a market for pollution permits; firms with low abatement costs can sell permits to those with higher costs, lowering total emissions to the cap. Because these approaches turn the externality into a price and let the market allocate abatement where it’s cheapest, they tend to achieve a more efficient outcome than rigid rules. In contrast, command-and-control regulation sets fixed limits or technology requirements, which can be inflexible and costly; voluntary guidelines lack enforcement, leading to uncertain results; subsidies for pollution encourage more pollution rather than reduce it.