Seems pretty self-explanatory to me. It doesn't cost anything (dollar-wise) to be polite. But politeness can "earn" much for you. Friendship, for instance, which can reap many rewards (monetary and otherwise). Politeness can open doors, and cause others to help you or at least be social with you who would not, if you were not polite.
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what are the social gains and failure of reconstruction era
Answer this question… It gains access to ideas that were developed outside the society.
rights and more labor availability
The right to vote and participate in government
Federalist No. 10