Which 18th-century pricing innovation is considered the precursor to modern book subscription services, where readers paid installments for books delivered in parts over time?

The publishing world has seen numerous pricing innovations throughout history, transforming how readers access literature. One particular model revolutionized access to books in the 18th century, creating the foundation for modern subscription services we see today in digital reading platforms like Kindle Unlimited and Scribd. Test your knowledge about this early subscription innovation that changed how literature was distributed and consumed!

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The Circulating Library model, where readers paid a membership fee to borrow books
Serial publication (or 'publishing in numbers'), where novels were released in affordable installments
The patron subscription system, where wealthy individuals funded an author's entire work upfront
The bookshop deposit scheme, where readers left collateral to borrow expensive volumes