Which innovative pricing strategy did Amazon initially use for books that disrupted traditional bookstore retail models and sparked industry controversy?

In the competitive world of book retail, pricing strategies have evolved dramatically over the decades. Independent bookstores, large chains, and e-commerce giants have all employed different approaches to win customer loyalty. This trivia question explores a pivotal moment in book retail history that changed how consumers purchase literature and reshaped the industry's pricing landscape. Test your knowledge about this significant shift in book retail pricing strategy!

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Loss leader pricing - selling bestsellers below cost to attract customers to the platform
Dynamic pricing - adjusting book prices hourly based on real-time demand algorithms
Subscription model - introducing the first 'all-you-can-read' monthly payment system
Bundle pricing - requiring customers to purchase books in curated collections rather than individually