Answer:
a. they tell us whether a firm is profitable or not.
Step-by-step explanation:
The shape of a firms curve tells us if a firm is profitable or not. If the firm is charging a higher price that is greater than its average cost of production for whatever quantity that was produced, we will have it that this firm will earn profits. But when the price that the firm is charging is smaller than its average cost of production, the firm will experience losses.