Which marketing innovation revolutionized mathematics textbook sales in the 2010s by allowing students to access only the specific chapters they needed?

The mathematics textbook industry has seen remarkable marketing innovations over the decades. Publishers have employed various strategies to differentiate their products in this competitive academic market. One revolutionary approach fundamentally changed how mathematics textbooks were marketed and sold to educational institutions. Test your knowledge about this significant shift in mathematics education product marketing!

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Modular purchasing systems that unbundled textbook content
Celebrity mathematician endorsement campaigns
Augmented reality problem-solving demonstrations
Free textbooks with premium online homework platforms