It's a pretty complex algorithm but to that extent, it's just another statistic to look at. If you're article/piece of content is 100% unique you will see 100% of the serps for the keywords associated. But yes, as your article gets syndicated you will gradually lose serps because of that but they don't "penalize" you for it as severely as most would like to assume, unless of course you're truly spamming the content across the net.
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