Suppose that fishing has caused a certain species of fish to be threatened with extinction.After banning fishing for many years, the fish population has rebounded.Now the government is proposing to introduce a system of tradeable fishing permits, which entitles the holder of each permit to catch a given number of fish each year.Explain how uncontrolled fishing led to a negative externality problem and how a system of tradeable fishing permits can potentially overcome the inefficiency caused by this negative externality.