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

The modern retail landscape has evolved dramatically over centuries, but some innovations fundamentally changed how we shop. Test your knowledge of retail history with this question about a revolutionary shopping concept that forever altered consumer behavior and set the foundation for modern retail experiences. Do you know which groundbreaking retail model first introduced self-service shopping?

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Piggly Wiggly (1916)
Marshall Field's Department Store (1852)
Sears Catalog (1888)
The Great Atlantic & Pacific Tea Company (A&P) (1859)