Which innovative marketing strategy helped Texas Instruments maintain its dominance in the educational calculator market despite having higher prices than competitors?

Texas Instruments (TI) has dominated the educational calculator market for decades, becoming a staple in mathematics classrooms worldwide. Their marketing strategy transformed what could have been ordinary calculating devices into must-have educational tools. This poll tests your knowledge about how TI's brand storytelling and product marketing created a calculator empire in the mathematics education industry.

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Establishing exclusive contracts with textbook publishers to feature TI calculators in math problems and examples
Offering free calculator software upgrades every six months to schools
Implementing a trade-in program allowing students to upgrade to newer models at half price
Creating calculator-exclusive math games that became popular in classroom competitions