In which decade was the first self-service grocery store (where customers could select their own products without clerk assistance) introduced in the United States?

Test your knowledge about a revolutionary retail concept that transformed how products were presented to customers and changed shopping behavior forever. This innovation fundamentally altered the relationship between customers and merchandise, setting the stage for modern retail experiences we take for granted today. Do you know when this pivotal shift in retail history occurred?

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1910s (Piggly Wiggly, founded 1916)
1930s (During the Great Depression)
1880s (After the Industrial Revolution)
1950s (Post-World War II retail boom)