Which innovative pricing strategy was first widely adopted by mathematics textbook publishers in the 2010s that significantly changed the market?

Mathematical textbooks have undergone significant pricing strategy changes over the decades. From traditional publishing models to digital disruption, the way these essential academic resources are priced and sold has evolved dramatically. This trivia question explores a fascinating pricing innovation that changed how students access higher-level mathematics content. Test your knowledge of educational product pricing in the mathematics industry!

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Dynamic pricing based on a student's prior math course performance
Access code subscription models that unbundled physical books from digital content
AI-powered personalized pricing based on predicted usage patterns
Blockchain-verified micro-transaction system for per-chapter purchases