In retail pricing strategy, which pricing tactic is known as 'charm pricing' and has been shown to increase sales by making products appear less expensive?

Pricing is both a science and an art in retail strategy. Beyond simple cost-plus calculations, sophisticated retailers use psychological tactics to influence consumer perception and purchasing behavior. This poll tests your knowledge of one of the most ubiquitous pricing strategies that has been proven to boost sales across multiple retail categories. Do you understand the psychological mechanisms that make certain price points more appealing than others?

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Prices ending in .99 or .95 (e.g., $19.99 instead of $20.00)
Buy-one-get-one-free offers that create a perception of doubled value
Premium pricing that sets prices artificially high to suggest superior quality
Bundle pricing that combines multiple products at a single 'rounded' price point