Which mathematical constant is commonly used as the basis for the 'charm pricing' strategy where prices end in .99 or .95?

The world of retail pricing isn't just about numbers—it's about psychology, strategy, and sometimes even mathematical principles. This poll explores how one famous mathematical constant has been utilized in modern pricing strategies. Test your knowledge about how mathematical concepts influence the way products are priced and marketed in today's competitive retail environment.

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• The Golden Ratio (φ, approximately 1.618)
• Weber's Fraction (the just noticeable difference in perception)
• Euler's Number (e, approximately 2.718)
• Fibonacci Sequence (each number is the sum of the two preceding ones)

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