Which pricing strategy do major mathematics textbook publishers most commonly use that creates the perception of value while maximizing revenue?

Pricing strategies in mathematics education products require careful consideration of perceived value, market positioning, and customer psychology. Publishers and educational technology companies use various mathematical models to determine optimal price points for textbooks, software, and learning tools. Test your knowledge about how mathematics product companies price their offerings to maximize both accessibility and profitability in this challenging pricing strategy trivia!

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Psychological pricing (setting prices just below round numbers, like $99.95 instead of $100)
Prestige pricing (deliberately high prices to convey quality and exclusivity)
Edition-based obsolescence (releasing new editions every 3-4 years with minimal changes)
Freemium model (basic content free with premium features behind paywalls)