Which mathematical concept is most commonly used by educational mathematics software companies when setting their 'optimal price points' for student licenses?

In the world of mathematics and retail, pricing strategies often intersect in fascinating ways. Mathematical principles can guide effective pricing decisions, from psychological price points to optimizing profit margins. This poll explores how mathematical concepts influence modern pricing strategies in educational mathematics products, where companies must balance perceived value with actual cost.

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The 9-ending price effect (e.g., $19.99 instead of $20.00)
Price anchoring with the Weber-Fechner logarithmic perception model
The Fibonacci sequence for tiered subscription models
Simple fractional pricing (1/3 off the regular price)