A temporary decrease in the price of oil would be considered a:
A. long-run supply shock.
B. demand shock.
C. short-run supply shock.
D. The changing price of oil would not affect any of these.
Answer: C
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Any point representing a cost and output combination that is below the long-run average cost curve:
a) may represent actual cost and production levels in the short run. b) represents unattainable cost levels. c) is attainable only when all factors are variable. d) is attainable if the firm minimizes its costs according to the "principle of substitution". e) represents less efficient cost levels than points on the long-run average cost curve.
A perfectly competitive firm will shut down rather than produce if its
A) price is less than average variable cost. B) price is less than total variable cost. C) total revenue is less than total cost. D) price is less than marginal cost.