Why is it importance to know what the
speaker's expertise is?

A speaker's perceived credibility is a combination of competence, trustworthiness, and caring/goodwill. Research has shown that caring/goodwill is probably the most important factor of credibility because audiences want to know that a speaker has their best interests at heart.

Explanation:

emerson essentially believes that traveling is overrated. he supports this perspective through an initial focus on "the idea" of places like italy, england, and egypt, and the fascination of "educated americans" with them. he argues that those places only took on the grand, majestic ideas that they represent because "they who made england, italy, or greece venerable in the imagination did so by sticking fast where they were, like an axis of the earth." yes, those places are grand, but only because they so clearly represent the places that they are. the art and culture of italy, england, and egypt is authentic, and therefore significant.

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