(b) Draw a diagram that shows a firm under perfect competition
making a profit in the short run. How is price determined in this
case?
(c) Draw a diagram to illustrate the case of perfect competition
where there is a negative production externality. Show how, if the
production externality is ignored, output will differ compared to
the alternative where society’s needs are taken into account.
Explain briefly how a tax could be relevant in achieving the social
optimum
(a) Sketch...