Which famous literary series pioneered the 'loss leader' pricing strategy in publishing by selling the first e-book at $9.99, dramatically below the hardcover price?

In the world of literature, pricing strategies can significantly impact a book's success and accessibility. From the days of Dickens to modern bestsellers, publishers have experimented with various pricing models to maximize both readership and profit. This trivia question explores a famous pricing experiment that revolutionized how we think about book pricing in the modern era. Test your knowledge about the business side of literature!

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Harry Potter series by J.K. Rowling
The Girl with the Dragon Tattoo series by Stieg Larsson
The Hunger Games trilogy by Suzanne Collins
Fifty Shades of Grey series by E.L. James