Which retail technology innovation from the 1970s first enabled comprehensive product-level sales analytics by encoding product information that could be scanned at checkout?

The history of retail has been shaped by technological breakthroughs that revolutionized how merchants track inventory and process sales. One particular innovation from the mid-20th century fundamentally transformed retail analytics, enabling the first real-time tracking of product sales and inventory levels. Test your knowledge about this pivotal moment in retail history that laid the groundwork for modern customer analytics and supply chain management.

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The Universal Product Code (UPC) barcode system
The Electronic Cash Register (ECR) with digital receipts
The Magnetic Stripe Reader for credit card transactions
The Automated Inventory Control System (AICS)