Which pricing strategy revolutionized the e-book market when Amazon introduced it for its Kindle platform in 2011, causing significant controversy in the publishing industry?

In the world of publishing and bookselling, pricing strategies play a crucial role in the commercial success of literary works. From traditional hardcover releases to digital e-books, publishers employ various pricing models to maximize both reach and revenue. This trivia question explores a notable pricing innovation that transformed how readers purchase and consume literary content. Test your knowledge about the business side of arts and literature!

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Agency pricing model, where publishers set final retail prices
Kindle Unlimited subscription service, offering unlimited reading for a monthly fee
Kindle Direct Publishing 70% royalty option for self-published authors
Kindle Singles pricing, selling short-form content at $0.99-$2.99