Which electronic calculator innovation first made these mathematical tools affordable enough for mass retail distribution in the early 1970s?

The retail industry was transformed when electronic calculators became affordable consumer products, changing how people shopped and how stores managed inventory and pricing. This poll explores a pivotal moment in retail product development that merged mathematics with consumer electronics, revolutionizing both industries and everyday shopping experiences.

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The Texas Instruments TI-2500 'Datamath' calculator, which pioneered the use of a single integrated circuit
The Hewlett-Packard HP-35, which introduced reverse Polish notation for complex calculations
The Sinclair Executive, which focused on miniaturization but remained expensive due to its complex components
The Casio Mini, which used vacuum tubes instead of transistors for cost reduction