Which pricing strategy led to a surprising 250% increase in sales for a specialized calculus visualization software when implemented by its developer in 2019?

In the world of educational mathematics products, pricing strategies can make or break market success. Publishers and developers of mathematics textbooks, software, and learning tools must balance accessibility with profitability. This trivia question explores a fascinating pricing phenomenon that occurred in the specialized mathematics education market that challenged conventional wisdom about premium pricing and perceived value.

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Premium pricing - raising the price by 40% and marketing it as a professional-grade tool
Freemium model - offering basic features free with paid advanced features
Subscription-based pricing replacing the one-time purchase model
Educational institutional discount - offering bulk licenses at 60% off retail price