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.
So long as the average cost curve is falling with the increase in output, the marginal cost curve lies below the average cost curve. When average total cost curve begins to rise, marginal cost curve also rises, passes through the minimum point of the average cost and then rises.