What psychological principle explains why retailers often price products at $9.99 instead of $10.00?

Pricing strategies aren't just about numbers—they're deeply rooted in psychology and consumer perception. This trivia question explores one of the most fascinating psychological pricing tactics used by retailers worldwide. Think you understand why certain price points are more effective than others? Test your knowledge of consumer psychology and pricing strategy with this challenge!

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Left-digit effect (consumers focus more on the first digit and perceive the price as significantly lower)
Perceived scarcity (odd-numbered prices suggest limited availability)
Recency bias (consumers remember the last digit most vividly)
Round number aversion (consumers are naturally suspicious of even-numbered prices)