Which market trend has had the MOST significant impact on mathematics textbook sales in North American universities over the past decade?

The mathematics textbook and educational resource market is a fascinating intersection of education, publishing, and technology. Over the decades, this market has evolved dramatically with changing educational standards, technological innovations, and pedagogical approaches. Test your knowledge about how mathematical educational materials are developed, marketed, and consumed in today's educational landscape.

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The rise of open educational resources (OER) and free online mathematics content
Increasing emphasis on STEM education in K-12 curricula
Integration of augmented reality features in textbooks
Growing popularity of international mathematics competitions