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