Which retail innovation, first introduced in the 1930s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail has seen dramatic transformations over centuries. From ancient marketplaces to digital storefronts, the evolution of how we buy and sell goods reflects broader societal changes. This poll explores a pivotal moment in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Test your knowledge about this revolutionary retail development!

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Self-service shopping carts (introduced by Sylvan Goldman for Humpty Dumpty Stores)
Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Barcode scanners (developed by IBM and first used commercially in 1974)
Department store catalogs (popularized by Montgomery Ward in the 1870s)