Content plays a big role in SEO as well to get the traffic to the website.To get the pagerank and traffic content should be changed periodically.
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Google has introduced google panda to find out duplicate content. Website having duplicate content affect its page ranking. So from SEO point of view always have unique content for your website. As it is said in Unique content is a soul of SEO
Search engines value good quality web pages because they like to offer their own visitors this same high level of quality through the provision of genuinely useful information on their search result pages. This means that they use complex algorithms in order to find those websites and web pages that they believe will benefit their own users. Good quality SEO content will generally lead the search engines to see this in your site, but excellent quality SEO content will almost certainly do so.