基礎ECON-PRDC-015
A firm’s fixed cost rises, with variable cost unchanged. In the short run, which curve shifts up?
A. Marginal cost only.
B. Average total cost, but not marginal cost.✓ 答案
C. Average variable cost and marginal cost.
D. Neither average total cost nor marginal cost.
解說
Fixed cost does not change when one more unit is produced, so marginal cost is unchanged. Average total cost includes fixed cost per unit, so ATC shifts up. AVC excludes fixed cost, so it stays put.