2. Suppose in a population of 100, there are 50 people have coronavirus. When testing, anyone who actually has the illness will receive a positive result. Also, 30 people receive a false positive.

What percent of people who receive a positive, will NOT actually have coronavirus?

5. Which of the following situations would represent a pecuniary externality?

Select one:

a. When the spillovers are positive rather than negative.

b. When a new dentist opens and lowers prices.

c. When there is a possibility of a transmissible illness.

d. When one's actions could physically harm another.