Again, if authors were paid what they thought was a fair price up front, you could eliminate copyright. But the very nature of the product makes its primary value (the words) easily copyable (unlike, say, foodstuffs), and the popularity of it uncertain, so businesses have decided they'd rather sell the item over time and see what they can get for it. Who would pay JK Rowling or George Lucas billions of dollars upfront for what their copyrights turned out to be worth?
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