QUOTE(johnstyle @ Jan 10 2014, 12:22 PM)
Duplicate content is harmful for the site as for SEO. If content is copied then search engine after crawls it does not give ranking in his organic search results. The results is that page should be go to backward.
Always avoid dubplicated content if you do not want Google to penalise your site.You site will not rank in search engine and affect your readers.