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I have hundreds of articles on my site and they range in length between 500 and 4000 words - with lots of photos. My retail pages usually have several hundred words of unique relevant content and they often link to article content (500 to 4000 words) that explains how to use the product, how to select, how to repair, etc.  These are clusters of content around retail products.  In my opinion, it is the best way to rank.... but sometimes your articles will rank better than your retail  --  but, that's OK because we have house ads on those pages to let visitors know that we sell the stuff.