Which country first implemented the concept of 'unmanned stores' at scale, where customers shop in physical stores without any human staff present?

The retail landscape is constantly evolving, with different regions pioneering unique approaches to shopping experiences. Geographic location has always played a crucial role in retail innovation, with certain countries leading the charge in specific retail technologies and customer experience strategies. Test your knowledge about which countries have been at the forefront of retail transformation!

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China
United States
Sweden
Japan