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

Before the 1900s, shopping was a completely different experience. Store clerks would fetch all items for customers from behind counters, making shopping a time-consuming process. Then came a retail revolution that forever changed how we shop. This trivia question explores a pivotal innovation in retail history that transformed the consumer experience and laid the groundwork for modern shopping as we know it today.

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Piggly Wiggly's self-service grocery store model
Woolworth's department store price tags
Sears Roebuck's mail-order catalog system
A&P's shopping cart introduction