Which mathematical concept has become a popular pricing strategy for mathematics educational software, where the premium version is priced at approximately 1.618 times the basic version?

In the world of mathematical product marketing, certain pricing strategies have emerged as particularly effective for educational tools, software, and resources. One such approach draws inspiration from mathematical concepts themselves. This poll tests your knowledge about how mathematical principles have influenced modern product pricing in the educational mathematics market.

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The Golden Ratio Pricing Model
The Fibonacci Sequence Strategy
The Pi-Based Pricing Approach
The Euler's Number Method