Which retail innovation, introduced by Clarence Saunders in 1916, fundamentally changed how customers shopped by allowing them to select their own items rather than having clerks gather products for them?

The history of retail has been marked by revolutionary innovations that transformed how we shop. From humble market stalls to global e-commerce empires, retail has evolved dramatically over centuries. This trivia question focuses on a pivotal moment in retail corporate history that forever changed the shopping experience and set the foundation for modern retail practices we take for granted today.

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Piggly Wiggly self-service grocery store
Macy's department store credit card
Sears Roebuck mail-order catalog
A&P's chain store expansion model