Which mathematical pricing strategy, based on number psychology, has been statistically proven to increase sales by making products appear less expensive than rounded prices?

Pricing strategies in retail are deeply rooted in mathematical principles and psychological insights. From dynamic pricing algorithms to price anchoring techniques, retailers use sophisticated mathematical models to maximize profits while maintaining customer satisfaction. This trivia question explores a fascinating mathematical pricing strategy that has been proven to significantly impact consumer behavior and purchasing decisions across multiple retail sectors.

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Psychological pricing (ending prices with .99 or .95)
Bundle pricing (offering product combinations at discounted rates)
Dynamic pricing (adjusting prices based on real-time demand)
Fibonacci pricing (setting price points based on the Fibonacci sequence)