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A book re-sold does return (usually part) of the payment (from which the author got his share) of the 1st time purchase to the reseller. No new item having value is created. Same as you keep the original and private copies all to you. No no value is traded. If you create a copy and put the original back into circulation you get value back from reselling the original AND keep the value of having the content in copy. Total value from your POV grows without the author having a share of it.
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