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

The history of retail is filled with innovations that transformed how we shop. Before the convenience of modern shopping experiences, pioneers had to develop new concepts that we now take for granted. This question explores one of the most significant early retail innovations that changed consumer behavior forever and set the foundation for modern retail chains.

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Piggly Wiggly (1916)
A&P (1912)
Woolworth's (1905)
Sears Roebuck (1925)