Which marketing strategy do mathematics textbook publishers most commonly use to differentiate their products from competitors?

In the mathematics education industry, publishers and educational technology companies employ various marketing strategies to promote their products. One particularly effective approach leverages a psychological principle to make products more appealing to mathematics educators and institutions. This question explores how mathematical product marketers use specific techniques to position their offerings in this specialized market.

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Research-based efficacy claims with statistical evidence
Celebrity mathematician endorsements
Limited-time promotional pricing
Vibrant, colorful designs with minimal equations