The shapes of firms' cost curves are important because: a. they tell us whether a firm is profitable or not.
b. they help us determine how much a firm will produce and even how it will produce it.
c. cost curves tell us the profitability of the firm.
d. they help us understand the market that the firm is in.

a. they tell us whether a firm is profitable or not.

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.

answer; property tax payment made in july and december;