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

Before big box stores and online shopping, retail was undergoing major transformations that shaped today's consumer experience. This trivia question explores a pivotal moment in retail history that fundamentally changed how people shopped and how products were sold. Test your knowledge about the historical innovations that led to modern retail practices!

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Piggly Wiggly's self-service grocery store format
Woolworth's price-marked merchandise system
Sears Roebuck's mail-order catalog shopping
Marshall Field's department store browsing concept