单项选择题

In the short run, an increase in output (marginal product) at low levels of production will most likely cause:

A. an increase in the marginal cost clue to the rising total cost.
B. an increase in the marginal cost due to the law of diminishing returns.
C. a decrease in the marginal cost due to economies from greater specialization.

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单项选择题The vertical distance between the average variable cost (AVC) curve and the average cost (AC) curve:

A. increases as output increases.
B. decreases as output increases.
C. remains constant as output increases.

单项选择题Which of the following most accurately describes the shapes of the average variable cost (AVC) curve and the average cost (AC) curve

A. The AVC curve and the AC curve are both U-shaped.
B. The AVC curve is U-shaped and the AC curve declines initially then flattens.
C. The AVC curve declines initially then flattens and the AC curve is U-shaped.