Answer:
Portion of its marginal cost curve that lies above its average variable cost curve.
Step-by-step explanation:
This is explained to be the portion of its marginal cost curve because marginal gross benefits exceeds marginal cost, the firm can earn greater profits by increasing its output.
These profits are been maximized by choosing to supply the level of output where its marginal revenue equals its marginal cost. When this revenue is below the said marginal cost, money is lost, and consequently, it must reduce its output. Profits are however utilized when the firm chooses the level of output where its marginal revenue equals its marginal cost.