Which retail innovation, introduced in 1916, first allowed customers to select their own products without clerk assistance, fundamentally changing shopping behavior?

Throughout history, retail has evolved dramatically with innovations that forever changed how we shop. One pivotal moment came when customers were first empowered to select their own products without clerk assistance - a revolutionary concept at the time that fundamentally transformed the retail landscape and laid the groundwork for modern shopping experiences. Test your knowledge of this historic retail transformation that shaped consumer behavior for generations to come.

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Piggly Wiggly's self-service grocery store
Woolworth's department store model
A&P's supermarket chain concept
Sears Roebuck's mail-order catalog system