Assume a hypothetical case where an industry begins as perfectly competitive and then
becomes a monopoly. Which of the following statements regarding economic surplus in
each market structure is true?
A) Under perfectly competitive conditions, economic surplus in this industry equals
consumer surplus plus producer surplus. Under monopoly conditions, some consumer
surplus is transferred to producer surplus, but economic surplus is the same as it was
under perfectly competitive conditions.
B) Under perfectly competitive conditions, economic surplus in this industry is
maximized. Under monopoly conditions economic surplus is minimized.
C) Under perfectly competitive conditions, economic surplus is equal to consumer
surplus; there is no producer surplus because firms are price-takers. Under monopoly
conditions, economic surplus is equal to producer surplus.
D) Under perfectly competitive conditions, economic surplus is maximized. Under
monopoly conditions economic surplus is less than under perfect competition and there
is a deadweight loss.
A recent study indicated that “Stricter college alcohol policies such as raising the price
of alcohol, or banning alcohol on campus, decreases the number of students who use
marijuana.” This indicates that the cross-price elasticity between alcohol and marijuana
is positive.