Which geometric concept inspired the 'Golden Ratio Pricing' strategy used by some educational retailers to price their premium math learning products?

In the world of retail mathematics, pricing strategies often follow mathematical principles. Retailers use various formulas to determine optimal price points, calculate discounts, and analyze sales data. This trivia question explores how a particular mathematical concept has influenced an innovative retail pricing strategy that gained popularity in specialty math supply stores and educational retailers. Test your knowledge of where retail operations and mathematical theory intersect!

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The Fibonacci Sequence (where each number is the sum of the two preceding ones, creating a ratio that approaches 1.618)
The Pythagorean Theorem (a² + b² = c²)
The Euler's Identity (e^(iπ) + 1 = 0)
Pascal's Triangle (triangular array of binomial coefficients)