Cap and trade

Building on our understanding of externalities and environmental policy, this episode demystifies one of the most prominent market-based solutions to pollution: cap and trade. We will break down this two-part mechanism, explaining how a government first sets a firm 'cap' on total emissions and then allows companies to 'trade' pollution permits among themselves. You will learn how this system puts a price on pollution, providing a flexible and economically efficient way to achieve environmental goals. We'll explore why economists often favor this approach over rigid regulations and examine its real-world applications and challenges in the fight against acid rain and climate change.

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What are the two core components of a cap-and-trade system?

  1. A tax on pollution and a government subsidy.
  2. A government-set limit ('cap') on total emissions and a market ('trade') for pollution permits.
  3. A command to use specific technology and a control on output levels.
  4. A ban on all pollution and a system of fines.
  5. A voluntary pledge by companies and a government reward system.

What does the 'cap' in a cap-and-trade system represent?

  1. The maximum price a permit can be sold for.
  2. The maximum amount of pollution a single firm is allowed to emit.
  3. The total, economy-wide limit on the emission of a specific pollutant for a given period.
  4. A limit on the number of companies that can participate in the market.
  5. The minimum amount of pollution a firm must reduce.

What is the primary economic advantage of cap and trade compared to a 'command-and-control' regulation that requires every firm to reduce pollution by the same amount?

  1. Cap and trade is easier for the government to administer.
  2. Cap and trade achieves the desired pollution reduction at a lower overall cost to the economy.
  3. Cap and trade completely eliminates all pollution.
  4. Cap and trade provides more certainty about the cost to individual firms.
  5. Command-and-control is always more effective.

In a cap-and-trade market, what primarily determines the price of a pollution permit?

  1. A price set directly by the government.
  2. The historical cost of pollution control technology.
  3. The forces of supply and demand, as firms buy and sell permits.
  4. The number of firms participating in the market.
  5. The global price of oil.

Which of the following are recognized challenges or criticisms of cap-and-trade systems?

  1. It provides no incentive for technological innovation.
  2. The price of permits can be volatile, creating uncertainty.
  3. The environmental outcome is uncertain.
  4. It can lead to 'carbon leakage', where industries move to unregulated regions.
  5. The political difficulty of setting a sufficiently strict cap.

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