In which decade was the first true self-service grocery store (where customers selected their own items) introduced, revolutionizing retail operations?

The way we shop today seems obvious - grabbing items off shelves ourselves and bringing them to checkout. But this 'self-service' model was once a revolutionary innovation that transformed retail forever. Before this shift, clerks gathered all items for customers from behind counters. Test your knowledge about this pivotal moment in retail history that fundamentally changed consumer behavior and store operations.

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• 1910s (Piggly Wiggly, founded 1916)
• 1930s (King Kullen, founded 1930)
• 1880s (The Great Atlantic & Pacific Tea Company, founded 1859)
• 1950s (Southland Ice Company/7-Eleven, founded 1927)

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