Which famous retail innovation was first widely implemented in military PX/BX stores before becoming standard in civilian retail during the 1990s?

The Post Exchange (PX) and Base Exchange (BX) systems represent one of the largest retail operations in military history, serving personnel worldwide. These retail giants have evolved from simple trading posts to comprehensive department stores, supporting morale and providing essential goods to service members. This trivia question explores how military retail analysis has shaped modern armed forces' readiness and satisfaction.

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Barcode scanning technology
Universal Product Code (UPC) system
Customer satisfaction surveys at point-of-sale
Self-checkout kiosks