What is a cap-and-trade system?

Question

Accepted Answer

A market-based approach that sets a limit on total emissions and allows companies to buy and sell emission permits. A cap-and-trade system is a market-based environmental policy approach that sets an overall limit (cap) on the total amount of a specific pollutant (such as CO₂ or SO₂) that can be emitted by all regulated sources combined. Emission permits or allowances are distributed to companies, and those that reduce their emissions below their allocation can sell their excess permits to companies that find it more expensive to reduce emissions. This creates a financial incentive to reduce pollution efficiently. The U.S. Acid Rain Program under the 1990 Clean Air Act Amendments was a highly successful cap-and-trade system for sulfur dioxide.

A ban on all industrial emissions is a command-and-control approach that would halt economic activity, which is far more extreme and inflexible than a cap-and-trade system. A tax on consumer goods based on environmental impact describes a form of environmental taxation or eco-labeling, which is a different policy instrument. A voluntary agreement between companies is a non-regulatory approach that lacks the enforceable emission limits central to cap-and-trade.

Market-based environmental policy instruments, including cap-and-trade and carbon taxes, are important topics on the DSST Environment and Humanity exam. Students should understand the economic theory behind these approaches (using market forces to achieve environmental goals efficiently), compare them with command-and-control regulations (direct emission standards), and know real-world examples such as the EU Emissions Trading System and the U.S. SO₂ trading program.

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