Final answer:
Underwriters gather information from medical, financial, and employer records to mitigate the risks of imperfect information but do not typically use social media as a formal source.
Step-by-step explanation:
Underwriters in the context of insurance or labor markets seek to mitigate the risks associated with imperfect information. When assessing an individual for insurance coverage or potential employment, they gather vast amounts of data to evaluate risk and predict behavior. In the context of underwriting, the sources from which underwriters can acquire information include medical records, financial records, and employer records. However, typically underwriters do not consider social media as a formal source of information for underwriting decisions, as it is less regulated and may not provide reliable or relevant data.