Which retail innovation, introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

The retail landscape has evolved dramatically throughout history. From small local shops to massive department stores and now e-commerce giants, retail innovation has shaped how we consume products. This trivia question focuses on a pivotal moment in retail history that forever changed the shopping experience and laid the foundation for modern retail as we know it today.

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Piggly Wiggly's self-service grocery store model
Macy's introduction of the department store concept
Sears Roebuck's mail-order catalog system
F.W. Woolworth's fixed-price 'five and dime' store