Which retailer first introduced the self-service shopping concept where customers could select their own merchandise without clerk assistance?

The landscape of retail has transformed dramatically over centuries, with certain innovations forever changing how we shop. In the early 20th century, one retailer pioneered a revolutionary concept that would become the foundation of modern shopping experiences worldwide. This innovation fundamentally altered customer behavior and set new expectations for convenience and product access. Test your knowledge of this pivotal moment in retail history!

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Piggly Wiggly (1916)
Woolworth's (1909)
A&P (1912)
Sears Roebuck (1925)