Which innovative retail management practice was FIRST implemented in U.S. military Post Exchanges (PX) during World War II that later became standard in civilian retail?

Post Exchange (PX) stores have been a cornerstone of military life for generations, providing essential goods and services to service members and their families worldwide. These unique retail operations have evolved significantly throughout military history, adapting to wartime conditions, technological changes, and the shifting needs of military personnel. Test your knowledge about how these military retail institutions have developed and influenced military life through the decades.

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Self-service shopping format
Credit card payment systems
Barcode scanning technology
Membership loyalty programs