Which retail innovation was first widely implemented in military exchanges (PX/BX) before becoming standard in civilian retail?

Military exchanges (PX/BX) have evolved dramatically since their inception, serving as crucial retail operations for military personnel and their families worldwide. These unique retail environments have pioneered innovations that later influenced civilian retail. Test your knowledge about how military retail operations have shaped modern shopping experiences while supporting military communities.

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• The first self-service grocery stores (1940s)
• Barcode scanning technology (1960s)
• Credit card payment systems (1950s)
• Online shopping catalogs (1980s)

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