Prices of commercial airline tickets (assume that this is a normal good) have fallen in
recent months. Over this same period, the price of jet fuel has risen and consumer
incomes have fallen. Which of the following best explains the falling prices of airline
tickets?
A) The supply curve for airline tickets has shifted to the left while the demand curve for
airline tickets has shifted to the left.
B) The demand curve for airline tickets has shifted to the left more than the supply
curve has shifted to the left.
C) The demand curve and the supply curve for airline tickets have both shifted to the
right.
D) The supply curve for airline tickets has shifted to the left more than the demand
curve has shifted to the left.
In the long run, firms in both monopolistically competitive markets and perfectly
competitive markets earn zero economic profits, but unlike perfectly competitive firms
in the long run, monopolistically competitive firms
A) charge a price that is greater than average revenue.
B) charge a price that is equal to marginal cost.
C) do not produce at minimum average total cost.
D) charge a price that is equal to average total cost.