Which one of the following statements is <strong>NOT</strong> correct?

  1. A. The market mechanism over-produces a good that generates positive externality.
  2. B. A cap and trade of pollution permits can be used by the government to achieve the social optimum.
  3. C. The optimal amount of subsidy in the case of an activity that produces a positive externality is the difference between the social benefit and the private benefit at the optimum.
  4. D. Tragedy of Commons is an example of negative externality.

Correct Answer: A. The market mechanism over-produces a good that generates positive externality.

Explanation

In a free market, goods that generate positive externalities are under-produced, not over-produced, because producers do not receive compensation for the external benefits provided to society.

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