Which pricing strategy did Texas Instruments famously use that helped their graphing calculators maintain market dominance in mathematics education for decades?

The world of mathematical products has its own unique marketing challenges and successes. From educational software to specialized calculators, companies use distinctive strategies to position their products in this intellectual marketplace. This poll tests your knowledge about a famous pricing strategy that revolutionized how mathematical tools are sold to students and professionals alike.

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Educational institution pricing - offering bulk discounts to schools while maintaining high individual retail prices
Subscription model - charging annual fees for calculator software updates and new mathematical functions
Freemium approach - providing basic calculators for free while charging for advanced mathematical capabilities
Dynamic pricing - adjusting calculator prices based on seasonal demand during back-to-school periods