Which country pioneered the concept of 'unmanned stores' (fully automated retail stores with no human staff) that became widely adopted across its major cities?

The geography of retail is constantly evolving as technology reshapes how customers shop around the world. Different regions adopt retail technologies at varying rates and in distinctive ways based on their infrastructure, cultural preferences, and economic development. This trivia question explores how retail technology adoption varies across different global markets, highlighting the fascinating intersection of geography and retail innovation.

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China
Japan
Sweden
South Korea