Which retail innovation, first widely implemented in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail has seen remarkable innovations that transformed how we shop. From ancient marketplaces to modern malls, retail history reflects broader economic and social developments. This trivia focuses on a pivotal moment that revolutionized consumer culture and shopping behaviors in the early 20th century, setting the foundation for modern retail experiences we take for granted today.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department store catalogs (popularized by Montgomery Ward)
Coin-operated vending machines (for food products)
Telephone ordering systems (home shopping predecessor)