Which retail innovation was specifically developed during WWII to improve military supply chains and later revolutionized civilian retail inventory management?

Throughout military history, armies have faced unique logistical challenges in supplying troops with essential equipment and goods. From ancient Rome to modern military operations, retail innovations have played a crucial role in maintaining military readiness and troop morale. This poll tests your knowledge about a significant retail innovation that revolutionized how armies supplied their forces in the field.

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Universal Product Code (UPC) barcode system
Just-in-Time (JIT) inventory management
Electronic Data Interchange (EDI)
Operations Research (OR) for inventory optimization