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The competition is probably an important factor for why some keywords on my website perform better than others, but I still wonder if my suspicion has any legitimacy.
joined:Jan 27, 2003
If there are duplicates or substantially similar articles on other sites, only one will rank well, and there's a real chance it won't be your copy.
It won't hurt the overall ranking of your website - just the ranking for articles that are duplicated.
This prevents some of the dupe issues previously mentioned.