Which retail pioneer is credited with opening the world's first true self-service grocery store in 1916, fundamentally changing the customer shopping experience?

Before modern retail experiences with AI-powered recommendations and seamless checkouts, a revolutionary concept forever changed how consumers shopped. In the early 20th century, one innovation dramatically transformed retail customer experience by putting product selection directly in shoppers' hands. This fundamental shift in retail management laid the groundwork for the supermarkets and department stores we know today, creating a new paradigm in customer autonomy and retail efficiency.

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Clarence Saunders with Piggly Wiggly
Frank Woolworth with F.W. Woolworth Company
Sebastian Kresge with S.S. Kresge Company (later Kmart)
John Hartford with the Great Atlantic & Pacific Tea Company (A&P)