Which pricing strategy did Texas Instruments implement in 2019 that dramatically increased its market share in advanced graphing calculators among university mathematics departments?

In the world of mathematics education and technology, pricing strategies can make or break a product's success. Companies selling mathematical software, educational tools, and advanced calculators must carefully consider their approach to pricing. This trivia question focuses on an innovative pricing strategy that revolutionized how mathematical tools are sold to educational institutions and professional mathematicians.

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Value-based pricing tied to the number of mathematical functions included in each calculator model
Institutional subscription model with unlimited calculator replacements and annual software updates
Dynamic pricing algorithm that adjusts calculator costs based on seasonal academic demands
Tiered pricing structure with free basic calculators and premium fees for advanced statistical functions