Which mathematical concept has been researched as having a potential psychological impact on premium pricing strategies in retail?

Pricing strategies in retail often involve mathematical principles to optimize profit margins and consumer psychology. One fascinating intersection of mathematics and retail pricing involves the strategic use of numerical patterns and principles. Test your knowledge about how mathematical concepts influence pricing decisions in the retail world. Do you know which mathematical principle has been studied for its potential influence on consumer perception of premium pricing?

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The Golden Ratio (approximately 1.618)
The Fibonacci Sequence
Euler's Number (e)
Pascal's Triangle