Which innovative retail strategy was first widely implemented by military surplus stores after World War II that revolutionized self-service shopping?

Throughout history, military surplus stores have played a fascinating role in retail strategy and consumer culture. After major conflicts, these specialized retailers helped repurpose military equipment for civilian use, creating unique retail environments and customer experiences. Test your knowledge about this interesting intersection of military history and retail strategy!

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The grid store layout with standardized aisles and sections
The use of metal shopping carts with folding baskets
Self-service bin merchandising with fixed price points
Warehouse-style open shelving with minimal staff assistance