Which mathematical concept revolutionized retail visual merchandising when Paco Underhill introduced it in his groundbreaking research on shopping behavior?

The integration of mathematics in retail has transformed how products are displayed, marketed, and sold. From inventory optimization algorithms to predictive analytics, mathematical principles underpin modern retail innovations. This trivia question explores how a specific mathematical concept revolutionized visual merchandising and product placement strategies that many retailers now take for granted.

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The Golden Ratio (1.618) for optimal product display proportions
Heat mapping and customer tracking algorithms to identify 'decompression zones'
Fibonacci sequence for arranging products in visually appealing patterns
Game theory applications for competitive product positioning