Which mathematical pricing strategy, based on the perception that prices just below a round number seem significantly lower, was first documented by the University of Chicago in 1936?

Psychological pricing is a fascinating intersection of mathematics and consumer behavior. Retailers carefully calculate price points to maximize perceived value and trigger purchasing decisions. This poll tests your knowledge about a specific mathematical pricing strategy that has revolutionized retail and continues to influence digital pricing models across e-commerce platforms. Think about the numbers you commonly see when shopping online or in stores - there's mathematical reasoning behind those specific digits!

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Charm pricing (ending in 9, like $9.99)
Bundle pricing (3 for $10)
Prestige pricing (deliberately high round numbers)
Dynamic pricing (algorithm-based fluctuations)