Which pricing strategy experiment by author Paulo Coelho led to a 10,000% increase in sales of his book 'The Alchemist' in the US market?

In the literary world, pricing strategies can make or break a book's success. From premium hardcovers to budget-friendly paperbacks, publishers carefully calculate price points to maximize both sales and prestige. This trivia question explores a fascinating pricing experiment that changed how we think about book marketing. Test your knowledge of the business side of literature!

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Temporarily making the e-book available for free, which dramatically boosted subsequent paid sales
Implementing a 'pay what you want' model where readers determined their own price point
Creating a limited edition luxury version at $1000 while dropping the standard edition to $9.99
Bundling the book with exclusive online content accessible through QR codes