Which pricing strategy holds the Guinness World Record for 'Most Widely Adopted Retail Psychology Technique' based on global implementation statistics from 2019?

The Guinness World Records includes fascinating entries about consumer behavior and retail milestones. Understanding how pricing psychology influences purchasing decisions has led to some remarkable world records in retail. This trivia tests your knowledge about a significant pricing strategy milestone that changed how retailers approach consumer psychology worldwide.

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Charm pricing (prices ending in .99)
Bundle pricing (buy-one-get-one)
Decoy pricing (strategic middle option)
Dynamic pricing (algorithm-based adjustments)