Which retail innovation, first introduced in the early 20th century, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Step back in time to explore one of history's most significant retail innovations that forever changed how people shop. Before this revolutionary concept emerged, most stores were small specialty shops where clerks retrieved items for customers. This innovation transformed retail by allowing customers to browse freely, select their own merchandise, and pay at centralized checkout areas - a fundamental shift in the shopping experience that we now take for granted. Test your knowledge of this pivotal moment in retail history!

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department stores (pioneered by Bon Marché in 1852)
Mail-order catalogs (pioneered by Montgomery Ward in 1872)
Vending machines (first modern version in 1883)