你熟悉哪部汉语工具书？（古代、现代皆可）它曾为你带来什么帮助？
Which of the following statements is true regarding the differences between economic and accounting costs?
Accounting costs include all implicit and explicit costs.
B. Economic costs include implied costs only.
C. Accountants consider only implicit costs when calculating costs.
D. Accounting costs include only explicit costs.
Fixed costs are fixed with respect to changes in
A. output.
B. capital expenditure.
C. wages.
D. time.
Which of the following costs always declines as output increases?
Average cost
B. Marginal cost
C. Fixed cost
D. Average fixed cost
E. Average variable cost
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