Which mathematical constant is widely used in retail design and product packaging to create aesthetically pleasing proportions that have been shown to increase customer retention?

In the intersection of mathematics and retail marketing, certain mathematical principles have been proven to influence consumer behavior and brand perception. Understanding these mathematical concepts can give retailers a competitive edge in store layout, product presentation, and visual marketing. This trivia question explores how one famous mathematical constant has been leveraged in retail digital transformation.

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The Golden Ratio (φ ≈ 1.618)
Euler's Number (e ≈ 2.718)
The Fibonacci Constant (ψ ≈ 3.359)
Feigenbaum's Constant (δ ≈ 4.669)