Which psychological marketing technique was pioneered by Texas Instruments for its graphing calculators in the 1990s that revolutionized math education product adoption?

The world of mathematics and product marketing might seem worlds apart, but some of the most successful educational math tools have relied on brilliant marketing campaigns to reach classrooms worldwide. Test your knowledge about how mathematical products have been marketed and the psychological strategies behind their success. Can you calculate the correct answer?

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Institutional loyalty marketing - creating calculator-specific textbooks that schools would adopt for multiple years
Celebrity mathematician endorsements - paying Fields Medal winners to promote their products in academic journals
Gamification of math concepts - including free games on calculators before gamification was mainstream
Seasonal discount strategy - timing price reductions to coincide with school budget planning cycles