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Which of the following is true regarding reduction of an externality such as pollution?
Pollution should be reduced as long as it provides health benefits to society.
Pollution should not be reduced if pollution abatement creates costs that negatively impact businesses.
Pollution should be reduced only if the average costs of pollution reduction are less than the average benefits.
Pollution should continue to be reduced as long as the marginal benefits of pollution reduction exceed the marginal costs.
Pollution should be reduced as long as the total benefits exceed the total costs.