One effect of the novel’s use of a first-person narrator is that

One effect of the novel’s use of a first-person narrator is that it gives an insight about narrator's thoughts and feelings.

Explanation:

When a novel is written with the point of view of a first person, the reader comprehends the story from the narrator's perspective.

So it becomes easier for the reader to understand the feelings of what the writer had tried to convey to his readers.

it not only provides the outer perspective but also gives an insight on narrator's thoughts and feelings.

scout gets in a bad position on the primary day of school since she can read and on the grounds that she can compose. she likewise gets in a bad position for explaining to miss caroline that she shouldn't attempt … to loan cash to walter on the grounds that he won't take it since he is to poor to pay it back.