Which consumer psychology technique was used in the Guinness World Record for the 'Largest Product Sampling Event' that distributed over 1 million samples in 24 hours?

World records aren't just about physical feats—they also exist in the world of retail and consumer behavior! This trivia question explores a fascinating intersection between consumer psychology and record-breaking retail strategies that changed how brands connect with customers. Test your knowledge about a psychological retail technique that earned its place in the record books!

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Scarcity principle (creating perceived limited availability)
Reciprocity (providing free samples to trigger purchase obligation)
Social proof (showing celebrity endorsements with each sample)
Anchoring (comparing sample size to full-price products)