In retail pricing strategy, which psychological pricing technique has been proven to increase sales by making prices appear significantly lower than they actually are?

Pricing strategy is both an art and a science in retail. Beyond simple cost-plus calculations, retailers use sophisticated psychological tactics to influence consumer perception and purchasing decisions. This poll tests your knowledge of one particularly effective pricing technique that has been validated through extensive consumer behavior research and is widely implemented across various retail sectors.

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Charm pricing (using prices ending in 9 or 99, like $19.99 instead of $20)
Bundle pricing (offering multiple products at a single price point)
Prestige pricing (setting artificially high prices to convey quality)
Price anchoring (showing original higher price alongside sale price)