Which innovative product launch revolutionized the book industry by allowing mass-market self-publishing with a 70% royalty option, enabling thousands of independent authors to bypass traditional publishers?

The book publishing industry has undergone dramatic transformations with technological innovation. Major retailers and publishers have launched various initiatives to change how readers discover, purchase, and experience literature. This poll tests your knowledge of significant product innovations that disrupted traditional book retail and publishing models.

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Amazon Kindle Direct Publishing (KDP)
Barnes & Noble's NOOK Press
Apple's iBooks Author
Penguin Random House's Partridge Publishing