Which psychological principle, discovered in the 1960s, explains why retailers place essential items (like milk and bread) at the back of stores, forcing customers to walk through the entire shop?

Impulse buying accounts for billions in retail sales annually, but the psychology behind these unplanned purchases reveals fascinating insights into consumer behavior and how retailers strategically design experiences. This trivia question explores one of the most influential psychological principles that changed how stores approach layout design—a discovery that revolutionized retail strategy and continues to influence modern shopping environments, both physical and digital.

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The Gruen Transfer Effect
Festinger's Cognitive Dissonance
The Hawthorne Effect
The Von Restorff Phenomenon