Which innovative retail strategy helped Texas Instruments maintain the TI-83 graphing calculator's premium price point (~$100) for over two decades despite minimal hardware upgrades?

Texas Instruments' graphing calculators transformed mathematics education and retail technology in the 1990s and beyond. The TI-83 series became a classroom staple and a fascinating retail phenomenon - maintaining remarkably stable pricing and market dominance despite minimal hardware changes over decades. This product's unique position in educational technology retail represents one of the most interesting product strategy case studies in STEM education markets.

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Creating an educational ecosystem where teachers developed and shared lessons specifically for TI calculators, increasing institutional adoption
Implementing a subscription model where students had to pay annual software renewal fees to maintain calculator functionality
Partnering exclusively with Apple to create calculator apps that synced only with TI physical devices
Utilizing blockchain technology to verify authentic TI calculators for standardized testing, blocking competitor devices