Answer:
a) loss caused to fisheries by pollution is an externality. B) Graph is attached
Explanation:
a) Externality is the cost benefit or loss to a 3rd party due to any activity that is not under its control. An exampe is pollution. In this scenario, losses to fisheries resulting from pollution by surf factory is an externality over. The pollution created by surfboard factory is not under the control of fisheries.
b) Graph is attached. As the production increases, Marginal Private Cost increases and Marginal Social Benefit decreses. Beyond Q2, Government intervention is requried