Refer to Figure 14-1. The firm's short-run supply curve is its marginal cost curve above

A) $2.
B) $4.
C) $6.
D) $13.

Marginal Cost Curve

It illustrates the change in total cost that arises when the quantity produced is incremented by one unit; this is the cost of producing one additional unit of a good.

Short-Run Supply

The supply provided by firms in the short term when at least one input, usually capital, is fixed.