Which pricing strategy is known as 'charm pricing' and is based on the psychological impact of certain price points?

Pricing strategies are crucial in retail and e-commerce, often influencing consumer perception and purchase decisions beyond the actual value of products. Psychological pricing techniques have been studied extensively and implemented across various industries. This trivia question explores one of the most effective yet subtle pricing tactics that continues to shape modern retail pricing models. Test your knowledge of consumer behavior and pricing psychology!

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Odd-ending pricing (e.g., $9.99 instead of $10.00)
Bundle pricing (e.g., 'Buy one get one free')
Premium pricing (deliberately setting prices higher than competitors)
Dynamic pricing (adjusting prices based on real-time demand)