Which psychological principle, discovered in the 1970s, explains why items placed at the checkout counter result in significantly higher impulse purchases?

Throughout history, retailers and inventors have studied consumer psychology to drive sales. One of the most fascinating aspects is how store layouts, product placements, and marketing techniques trigger unplanned purchases. This poll explores a groundbreaking discovery in consumer psychology that revolutionized modern retail strategies and led to billions in additional revenue worldwide. Test your knowledge about the science behind why we buy things we didn't plan to!

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The Diderot Effect - the tendency to purchase additional items that complement something you've already decided to buy
Decision Fatigue - by the end of shopping, mental energy is depleted making shoppers more susceptible to small, low-consequence purchases
The IKEA Effect - consumers value products more when they've invested effort into obtaining them
The Endowment Effect - once shoppers mentally 'own' an item in their basket, they're more likely to add complementary products