Which famous mathematical constant is often used as a basis for 'prestige pricing' in high-end mathematics software and educational tools, with price points typically set at multiples of this number?

In the world of mathematics education products and textbooks, pricing strategies often incorporate mathematical principles to appear more appealing or logical to their target audience. One famous mathematical concept has been particularly influential in product pricing psychology, especially for premium educational tools and software. This poll tests your knowledge of how mathematical concepts intersect with product marketing strategies in the educational mathematics industry.

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The Golden Ratio (approximately 1.618)
Pi (approximately 3.14159)
Euler's Number (approximately 2.71828)
The Square Root of 2 (approximately 1.414)