It also stimulates production of IGF-1. GH is used as a prescription drug in medicine to treat children's growth disorders and adult growth hormone deficiency. In the United States, it is only available legally from pharmacies, by prescription from a doctor.
Marginal cost is the change in total cost when another unit is produced; average cost is the total cost divided by the number of goods produced. Distinguish between marginal and average costs. The marginal cost is the cost of producing one more unit of a good.
The marginal cost curve is significant in the theory of the firm for two reasons: It is the leading cost curve, because changes in total and average costs are derived from changes in marginal cost. The lowest price a firm is prepared to supply at is the price that just covers marginal cost.