Which psychological principle explains why retailers often place essential items (like milk) at the back of stores, forcing customers to walk through the entire shop?

Retailers strategically design store layouts and marketing tactics based on consumer psychology principles. Understanding these tactics can help both businesses optimize their sales strategies and consumers become more aware of their purchasing decisions. This trivia question explores a fascinating aspect of retail psychology that significantly impacts consumer behavior in physical and online stores.

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The Gruen Transfer - disorienting customers to encourage unplanned spending
The Exposure Effect - increasing product familiarity through repeated visual contact
The Servicescapes Model - creating emotional responses through environmental design
The Boomerang Effect - strategically positioning high-demand items to maximize exposure to other merchandise