Which innovative retail strategy did Amazon initially use to revolutionize the book industry before expanding to other product categories?

The book retail landscape has transformed dramatically over the past few decades. Independent bookstores, chain retailers, and digital platforms have all played crucial roles in how readers discover and purchase literature. This poll tests your knowledge of a major innovation that disrupted traditional book retailing and changed how millions access literature.

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The 'showrooming' model, encouraging customers to browse physical bookstores then purchase online at lower prices
The 'infinite shelf' concept, offering vastly more titles than physical bookstores could stock
The subscription-based 'book club' model, sending curated monthly selections to readers
The 'print-on-demand' service, eliminating inventory by printing books only after purchase