Include a brief summary of the paper's main points, ensuring the reader has read what you wanted to communicate. Do not repeat details and specific examples; the whole summary should be one or two sentences.
Restate the thesis of your paper without repeating it word-for-word. If the aim of your paper was to prove the validity of a sentence ("Mezzanine financing is the best option for Company A,") but you reached the opposite conclusion, mention it explicitly.
Mention implications of your thesis or issues of interest your paper did not focus on. For example, recycling envelopes can be a huge step towards saving natural resources, but plastic parts on a large number of envelopes render them unrecyclable.
End with a suggestion or warning. All sorts of papers, even personal stories, have a special lesson for readers: It can be that stereotypes can destabilize a society, or that you must beware of deers trying to stealing your food basket on a picnic.
Compare the contents of your paper to previous research or personal stories. Possibly your social study just reiterates what previous researchers have noted, or it contradicts them. As another example, state your similar bad luck in previous excursions to the countryside, or stress that this particular story was the exception.
Avoid cliches, obvious comments, unfounded generalizations and sentimental sentences. Do not include new ideas or specific information in the closing paragraph; return to the main body and either add a new paragraph or place the new information with similar data.