Which retail innovation was first widely implemented in U.S. military exchanges (PX/BX) during World War II, revolutionizing inventory management before becoming standard in civilian retail?

Military exchanges (PX/BX) have evolved dramatically since their origins, becoming sophisticated retail operations that serve military personnel worldwide. These unique retail environments have pioneered innovations that later spread to civilian retail. Test your knowledge about one of the most significant retail innovations that originated in military exchanges during a crucial historical period.

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Self-service shopping format
Barcode scanning systems
Credit card payment processing
Computerized inventory tracking