Which pricing strategy did GeoGebra use that transformed it from a niche tool to one of the world's most widely used mathematics software platforms?

In the world of educational mathematics products, pricing strategies often follow unique patterns based on perceived value, market positioning, and educational impact. Many successful mathematics learning platforms have made counterintuitive pricing decisions that transformed their market position. This poll tests your knowledge about a famous pricing strategy case study in the mathematics education industry that challenged conventional wisdom.

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Freemium model with institutional licensing for advanced features
Premium-only model with significant educational discounts
Subscription-based pricing with declining monthly rates for longer commitments
Tiered pricing based on the complexity of mathematical concepts accessed