Which technological innovation first enabled retailers to systematically collect and analyze customer purchase data at scale?

Before sophisticated AI algorithms and big data transformed retail, one groundbreaking technological innovation fundamentally changed how retailers understood customer behavior. This invention marked the first time purchase patterns could be systematically tracked and analyzed at scale, creating the foundation for today's advanced retail analytics. Test your knowledge about this pivotal moment in retail technology history that forever changed how businesses understand consumer preferences.

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Electronic point-of-sale (EPOS) systems with barcode scanning
Customer loyalty cards with magnetic strips
Online shopping carts with cookie tracking
RFID inventory management systems