Which retail payment innovation was first introduced by IBM in 1973, revolutionizing checkout systems and inventory management?

Throughout history, retail payment systems have evolved dramatically, transforming how people shop and businesses operate. From ancient barter systems to today's contactless payments, each innovation has shaped retail strategy and consumer behavior. This trivia question focuses on a pivotal moment in retail payment history that fundamentally changed the shopping experience and created new possibilities for merchants and customers alike.

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• The Universal Product Code (UPC) barcode scanning system
• The magnetic stripe credit card reader
• The electronic cash register (ECR) with digital display
• The PIN pad for debit card transactions

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