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

The evolution of retail has been marked by groundbreaking innovations that transformed how we shop. One of the most significant shifts was the introduction of self-service shopping, which fundamentally changed the customer experience and retail operations forever. This innovation eliminated the need for clerks to retrieve products for customers, allowing shoppers to browse and select items themselves. Can you identify which pioneering retail concept first introduced this revolutionary approach to shopping?

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Piggly Wiggly (1916) - The first true self-service grocery store with checkout turnstiles
A&P Economy Stores (1912) - The first chain store model with standardized product selection
King Kullen (1930) - The first supermarket with departmentalized food sections
Southland Ice Company (1927) - The convenience store concept (later 7-Eleven)