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

The retail landscape has undergone dramatic transformations throughout history. From ancient marketplaces to modern e-commerce giants, retail innovation has shaped how we shop, what we buy, and how products reach our hands. This trivia question explores a pivotal moment in retail history that forever changed the shopping experience and set the foundation for modern retail strategies. Test your knowledge of this revolutionary retail development!

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Self-service grocery store (Piggly Wiggly)
Department store credit card (Filene's)
Mail-order catalog with money-back guarantee (Montgomery Ward)
Price tags with fixed pricing (Macy's)