Which psychological pricing strategy did researchers find most effective at creating the perception of a bargain, leading to its widespread adoption by retailers globally?

The psychology behind pricing strategies has transformed modern retail. One particular pricing technique has become ubiquitous in stores worldwide, influencing consumer perception of value and affordability. This technique creates the illusion that products are significantly cheaper than they actually are, and has been proven to boost sales across various industries. Test your knowledge of this influential retail psychology concept that shapes shopping behaviors worldwide.

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Charm pricing (ending prices with .99 or .95)
Bundle pricing (offering product combinations at a discount)
Prestige pricing (deliberately pricing higher to suggest quality)
Dynamic pricing (adjusting prices based on demand in real-time)