Utility is the concept that economists use to measure the a person gets from the use or consumption of goods and services. no options

Satisfaction

Explanation:

In economic theory, use is a concept that aims to measure consumer satisfaction by purchasing goods and services. Thus, the theory explains that the consumer will buy the basket of goods that best satisfy their utility. The utility for each consumer is different, as each consumer demands goods according to their tastes and preferences. Thus, each consumer buys according to their needs, to generate satisfaction, which represents the utility of the demand for goods and services.

6. true

hiv/aids are in fact really common in blood types