Which graphing calculator brand has maintained over 80% market share in US high schools since the 1990s, despite minimal changes to their flagship products and relatively stable pricing?

The handheld graphing calculator market represents one of the most interesting retail monopolies in educational technology. For decades, these devices have been essential tools in mathematics education, with pricing and distribution strategies that defy typical retail trends. Test your knowledge about this unique intersection of mathematics education and retail business strategy!

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Texas Instruments (TI)
Casio
HP (Hewlett-Packard)
Sharp