Which retail merchandising strategy has been statistically proven most effective for increasing sales of advanced mathematics learning products in the last decade?

In the world of mathematics education product development, certain retail strategies have proven particularly effective at engaging students and driving sales. Math education products—from textbooks to digital learning platforms—rely on specific merchandising techniques backed by market research and educational psychology. This trivia question explores a key market trend that has transformed how mathematical learning tools are positioned and sold in both physical and online retail environments.

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Solution-based categorization (organizing products by the mathematical problems they help solve rather than by traditional subject divisions)
Grade-level segmentation (strict organization of products by academic year/grade regardless of skill level)
Celebrity mathematician endorsements (featuring prominent mathematicians on packaging and promotional materials)
Aesthetic-first design (prioritizing visually appealing packaging over content descriptions)