Which major retail innovation was first widely implemented by the U.S. military during WWII, then revolutionized civilian retail after the war?

During World War II, military equipment production transformed retail operations forever. The massive scale of manufacturing and distribution created new systems that would later revolutionize civilian retail. Companies that once made consumer goods pivoted to wartime production, developing innovative retail and inventory strategies that would change commerce forever. This poll tests your knowledge of how military procurement influenced modern retail operations.

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Standardized SKU (Stock Keeping Unit) tracking systems
Self-service shopping layouts
Point-of-sale computerized terminals
Shopping cart design