Suppose that firms in a competitive industry are earning positive economic profits. All else equal, in the long run, we would expect the number of firms in the industry to

If the pollution havens hypothesis is true, we should expect world pollution to decline as a result of international trade and globalization

Indicate whether the statement is true or false

Many economists argue that the most efficient way to control pollution is to

A. ban all activities that create pollution. B. enforce legal standards on air and water quality. C. promote environmental awareness among citizens. D. impose taxes on emissions.