1. Suppose the marginal cost curve in the short run first decreases and then increases. If marginal cost is decreasing, _____ must be _____ and _____ must be _____.

A. average total cost; increasing; marginal cost; decreasing

B. marginal product; increasing; average fixed cost; decreasing

C. average variable cost; decreasing; average fixed cost; increasing

D. marginal product; increasing; average variable cost; decreasing

2. Marginal cost is the change in _____ cost resulting from a one-unit change in _____.

A. total; output

B. average; output

C. total; a variable input

D. total; average cost