Which psychological pricing strategy was found to increase sales by 24% compared to round number pricing in a 2018 Cornell University retail study?

Test your knowledge of psychological pricing strategies that influence consumer purchasing decisions. Beyond basic economics, successful pricing involves understanding cognitive biases and consumer perception. This poll explores a specific psychological pricing tactic that has been proven to significantly impact sales across various industries. Can you identify which technique has been empirically shown to be most effective?

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Charm pricing (e.g., $9.99 instead of $10.00)
Prestige pricing (intentionally pricing higher to suggest quality)
Bundle pricing (offering products together at a discounted rate)
Dynamic pricing (adjusting prices based on demand in real-time)