Which psychological principle explains why retailers often place small, inexpensive items near checkout areas?

Retailers have long studied the psychological factors that drive consumer behavior, particularly when it comes to unplanned purchases. Understanding these triggers helps companies design store layouts, digital interfaces, and marketing strategies that capitalize on human decision-making patterns. This trivia question explores a fascinating concept from consumer psychology that retailers leverage to boost sales.

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The Diderot Effect - where acquiring one new item leads to a spiral of additional purchases to maintain a cohesive self-image
The Weber-Fechner Law - which states that consumers become less sensitive to price differences as the base price increases
The Endowment Effect - where people overvalue items they already possess, making them reluctant to give them up once touched
The Goal-Gradient Effect - where consumers become more susceptible to impulse buys as they approach the completion of their shopping journey