What pricing strategy is uniquely common in mathematics educational software and textbooks that leverages mathematical thinking itself?

In the world of mathematical educational products, pricing strategies often follow specific patterns based on psychological principles and market research. Understanding these pricing models can help educators and institutions make better purchasing decisions for classroom materials, software licenses, and educational tools. This trivia question explores an interesting phenomenon in how mathematics textbooks and software are priced to maximize adoption in educational settings.

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Fibonacci Pricing: Setting prices that follow the Fibonacci sequence (e.g., $8, $13, $21, $34) to create a perceived mathematical elegance
Prime Number Pricing: Setting prices at prime numbers (e.g., $17, $23, $29) to create a psychological perception of indivisibility and value
Golden Ratio Pricing: Setting price tiers that maintain approximately a 1:1.618 ratio between adjacent options to create visually appealing price ladders
Exponential Pricing: Setting prices that double with each tier (e.g., $16, $32, $64) to reflect the exponential growth in features and capabilities