Which innovative product development strategy revolutionized mathematics textbook sales in the early 2000s?

The mathematics textbook market has seen significant transformations in product development and marketing strategies over the years. Publishers have had to adapt to changing educational landscapes, technological advances, and evolving consumer preferences. This poll tests your knowledge about a pivotal product development strategy that changed how math textbooks are marketed and sold to educational institutions.

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Modular textbook systems allowing instructors to customize content for their specific courses
Limited edition collector textbooks with famous mathematician signatures
Subscription-based textbook rental programs with monthly payments
Interactive holographic displays for geometry concepts