Which innovative retail strategy was FIRST implemented by the U.S. Army Post Exchange (PX) system during WWII that later became standard in civilian retail?

The Post Exchange (PX) system has been a crucial part of military life for centuries, evolving from simple sutlers following armies to sophisticated retail operations. This poll explores how military retail innovation has changed to meet the needs of service members throughout history, reflecting broader trends in retail analytics and customer loyalty that eventually influenced civilian retail practices.

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Credit card payment systems
Global standardized inventory management across all locations
Self-checkout kiosks
Customer loyalty point programs