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Assume the vitamin industry is perfectly competitive. When a new medical study shows that taking vitamins improves both the quality and length of life, demand for vitamins increases dramatically. As a result, vitamin producers' profits will O A. remain unchanged in both the short-run and the long-run. O B. decrease in the short-run but become positive in the long-run. O C. increase in the short-run but fall to zero in the long-run. O D. increase in the short-run and in the long-run