The upshot: From an e-book sale, an author makes a little more than half what he or she makes from a hardcover sale.

The new economics of the e-book make the author’s quandary painfully clear: A new $28 hardcover book returns half, or $14, to the publisher, and 15%, or $4.20, to the author. Under many e-book deals currently, a digital book sells for $12.99, returning 70%, or $9.09, to the publisher and typically 25% of that, or $2.27, to the author.

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