Which early retail technology innovation from the 1970s revolutionized supply chain management and is considered the precursor to modern IoT inventory systems?

The retail landscape has evolved dramatically throughout history, with technological innovations reshaping how consumers shop and how merchants sell. From ancient marketplaces to today's AI-powered experiences, retail has always been at the intersection of commerce, culture, and innovation. This trivia question explores a pivotal moment in retail history that fundamentally changed product management and consumer behavior.

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Universal Product Code (UPC) barcode system
Electronic cash registers with digital displays
First retail credit card with magnetic stripe
Computerized inventory management software