Which retail strategy fundamentally transformed the mathematics textbook market in the 2010s, leading to a 40% increase in accessibility for college-level mathematics resources?

The mathematics textbook industry has undergone significant transformations in recent years, adapting to digital learning environments and changing educational needs. Publishers have employed various strategies to maintain relevance in an increasingly competitive market. This poll explores a notable retail strategy that revolutionized how mathematics textbooks are sold and distributed to educational institutions and individual learners.

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The subscription-based access model allowing temporary digital licenses instead of permanent ownership
Bundling physical textbooks with mandatory online homework systems
The introduction of augmented reality components in premium textbook packages
Implementing regional pricing structures based on university mathematics department size