Which pricing strategy has been shown to increase sales more effectively than standard pricing, according to multiple retail studies?

Pricing is both an art and a science in the business world. Behind many price tags lies careful psychological strategy designed to influence consumer behavior. This trivia question explores one of the most effective yet subtle pricing techniques used by retailers worldwide. Test your knowledge of pricing psychology and see if you can identify which strategy has been proven most effective in studies of consumer behavior.

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Charm pricing (ending prices with .99 or .95)
Bundle pricing (offering multiple products at a combined price)
Prestige pricing (deliberately pricing higher to suggest quality)
Dynamic pricing (changing prices based on demand in real-time)