What is "an agreement reached by mutual concessions"?

Scout feels discouraged returning home from school. After dinner she tells Atticus she doesn't want to go back. Atticus asks her to understand the situation from Miss Caroline's point of view - Miss Caroline can't be expected to know what to do with her students when she doesn't know anything about them yet. Scout wants to be like Burris Ewell and not have to go to school at all. As Atticus explains, the town authorities bend the law for the Ewells because they'll never change their ways - for instance, Mr. Ewell can hunt out of season because everyone knows he spends his relief checks on whiskey and his children won't eat if he doesn't hunt. Atticus teaches Scout about compromise: if she goes to school, Atticus will let her keep reading with him at home. Scout agrees and Atticus reads to her and Jem from the papers.