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It is a guess on how much your hub might earn. The more dollar signs the more money hubpages thinks the hub might earn.
You can help the HubPages community highlight top quality content by ranking this answer up or down.
It's a quick estimate based on the value of keywords you used in the article (I think). It's very inaccurate though, so don't give it too much thought :)
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Copyright © 2017 HubPages Inc. and respective owners.