Main articles: Growth hormone 1 and Growth hormone 2. Genes for human growth hormone, known as growth hormone 1 (somatotropin) and growth hormone 2, are localized in the q22-24 region of chromosome 17 and are closely related to human chorionic somatomammotropin (also known as placental lactogen) genes.
Average costs are U-shaped, and the marginal cost curve intersects the average cost curves at their respective minimum points. In the competitive model of the firm, the minimum average variable cost is termed the shutdown point because a firm will not produce in the short run if price is below average variable cost.
Example: For example, the total cost of producing one pen is $5 and the total cost of producing two pens is $9, then the marginal cost of expanding output by one unit is $4 only (9 - 5 = 4). The marginal cost of the second unit is the difference between the total cost of the second unit and total cost of the first unit.The marginal cost of the 5th unit is $5. It is the difference between the total cost of the 6th unit and the total cost of the, 5th unit and so forth.he long run marginal cost curve like the long run average cost curve is U-shaped. As production expands, the marginal cost falls sharply in the beginning, reaches a minimum and then rises sharply.