“Most old pages do have value for users, so I recommend keeping the pages themselves alive forever. Sure, new content is probably more valuable than old content, but there is more old content to chose from. As an example, consider a site that publishes new content on a weekly basis. After a year, this site will consist of 51 old editions and one new edition. Assuming that new content is ten times as valuable as old content, 84% of the site’s value comes from old content.”
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