Which retail analytics innovation was first widely implemented in military Post Exchanges (PX) during the 1970s before being adopted by civilian retailers?

The Post Exchange (PX) system represents one of the most unique retail operations in history, serving military personnel worldwide. These stores have evolved from simple trading posts to sophisticated retail operations with their own branded products, payment systems, and marketing strategies. This trivia question explores the corporate history behind this distinctive military retail institution that has shaped both military life and civilian retail practices.

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Barcode scanning inventory management systems
Customer loyalty card programs
Self-checkout kiosks
Electronic shelf labeling