Which pricing strategy is known as 'charm pricing' and has been shown to increase sales by leveraging psychological perception?

Pricing strategies are far more than just numbers - they're powerful psychological tools that influence consumer decision-making in complex ways. The most successful retailers and marketers understand that how a price is presented can be just as important as the actual amount. This trivia question explores an intriguing aspect of psychological pricing that has been proven to significantly impact purchasing behavior across various retail environments.

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Ending prices with .99 or .95 (e.g., $19.99 instead of $20)
Displaying the original price alongside the discounted price (e.g., 'Was $50, Now $30')
Offering bundle pricing that includes complementary products at a small discount
Using round numbers for premium products to signal quality (e.g., $100 instead of $99.95)