Final answer:
The author includes this excerpt to establish credibility.
Step-by-step explanation:
Credibility refers to the quality of being trusted, reliable, and believable. It is the perception that others have about the integrity, competence, and trustworthiness of a person, organization, information, or source. Credibility is crucial in various contexts, including communication, relationships, and decision-making.
The author includes this excerpt to establish credibility. By including their credentials or experience with the subject, the author ensures that readers will take them seriously as someone who knows what they're talking about. Additionally, citing reliable sources as support for their points reinforces their authority.