Which country first implemented the 'just-in-time' inventory management system that revolutionized global retail supply chains in the 1970s?

The landscape of retail has been shaped not just by consumer preferences, but also by geographical innovation. Certain regions pioneered revolutionary retail concepts that transformed how products reach consumers worldwide. This trivia tests your knowledge about a significant geographical milestone in retail supply chain management that changed the industry forever.

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Japan (through Toyota's kanban system)
United States (through Walmart's distribution model)
Germany (through Aldi's lean inventory approach)
Sweden (through IKEA's flat-pack logistics system)