1-31The Finding That People with One Type of Serotonin Transporter

question 16

Multiple Choice

1-31.The finding that people with one type of serotonin transporter gene and childhood maltreatment had higher rates of depression than either those without the gene or those with the gene without the maltreatment suggests that

• A)childhood maltreatment causes depression.
• B)only one type of gene causes depression.
• C)either or a gene or certain environmental factors need to be present to cause depression.
• D)both a gene and certain environmental factors need to be present to cause depression.

---

Definitions:

AVC

Average Variable Cost, the cost that varies with the level of output, divided by the quantity of output produced.

Total Fixed Cost

The sum of all costs that do not change with the level of output produced; these costs are incurred even if production is zero.

Marginal Cost

The increase in cost resulting from the production of one additional unit of a good.

Variable Cost

Costs that change in proportion to the level of activity or volume of production in a company.