Which psychological principle explains why retailers often place small, inexpensive items near checkout counters to encourage impulse purchases?

Retailers and product marketers carefully design store layouts and packaging to trigger impulse buying behaviors. Understanding the psychology behind these tactics reveals how companies influence our purchasing decisions without our conscious awareness. Test your knowledge about the psychological triggers that lead consumers to make unplanned purchases and how retailers leverage these insights to boost sales.

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The Endowment Effect - once consumers are committed to making a purchase, they're more likely to add additional items
The Scarcity Principle - items placed at checkout appear more exclusive and limited in availability
The Authority Principle - checkout areas are perceived as authoritative zones where purchases are validated
The Contrast Effect - after committing to larger purchases, small additional items seem insignificant in cost