In a perfectly competitive market, an increase in market demand in a long-run constant-cost industry causes:
A. a decrease in price, a decrease in quantity, and a decrease in profit in the short run.
B. an increase in price, quantity, and profit in the long run.
C. an increase in price, quantity, and profit in the short run.
D. a decrease in price, a decrease in quantity, and a decrease in profit in the long run.
Answer: C
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