Which pricing strategy has Texas Instruments famously employed with their graphing calculators that has puzzled economists for decades?

Texas Instruments has been a cornerstone in mathematics education for decades. Their graphing calculators have dominated classroom settings, becoming almost synonymous with high school and college math courses. This poll tests your knowledge about this iconic brand's marketing strategy and how it has maintained its remarkable market position despite the digital revolution.

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Price stability - TI calculators have maintained nearly the same price point since the 1990s despite decreasing production costs
Seasonal pricing - TI dramatically reduces prices during summer months when students aren't in school
Educational bundling - TI calculators are sold at cost to schools but with premium-priced required textbooks
Subscription model - TI pioneered a 'calculator-as-a-service' model where students pay annual fees for continued functionality