Which pricing strategy, first implemented by Texas Instruments for their graphing calculators in 2019, used a dynamic algorithm based on student performance to adjust subscription costs?

Pricing strategies in mathematics education products have evolved dramatically over the years. From traditional textbooks to digital learning platforms, companies have experimented with various approaches to balance accessibility with profitability. This trivia question focuses on an innovative pricing model that revolutionized how mathematical learning tools are marketed and sold to educational institutions and individual learners.

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Performance-Scaled Pricing (PSP): Higher calculator functionality unlocked as student test scores improved
Achievement-Based Billing (ABB): Schools paid less when student math scores exceeded district averages
Difficulty-Adjusted Rates (DAR): Subscription rates decreased as students progressed to more complex mathematical topics
Competency-Tiered Pricing (CTP): Base functionality free, with premium features unlocked through solving increasingly complex equations