What unprecedented pricing strategy did Bloomsbury Publishing use for the adult editions of Harry Potter books that revolutionized the book market?

J.K. Rowling's Harry Potter series wasn't just a literary phenomenon—it also revolutionized book pricing in the publishing industry. As the series gained popularity, publishers employed innovative pricing strategies that influenced the entire book retail landscape. This poll tests your knowledge about a notable pricing decision that helped make the series accessible while maximizing its market reach.

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Creating premium leather-bound collector's editions at triple the price of standard editions
Releasing identical content in adult covers at higher price points than the children's editions
Implementing dynamic pricing that increased book costs as each sequel was released
Offering subscription-based pricing where readers pre-paid for the entire series at a discount