Which retail innovation, first implemented in the 1910s, allowed customers to select their own products without clerk assistance, fundamentally changing the shopping experience?

The retail industry has evolved dramatically over centuries, with some innovations so transformative they changed shopping forever. This poll explores a pivotal retail innovation from history that revolutionized how consumers interact with products. Test your knowledge about a retail concept we now take for granted but was once considered revolutionary. Do you know which historical retail innovation first allowed customers to browse and select products without assistance?

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Self-service grocery stores, pioneered by Piggly Wiggly in 1916
Department store catalogs, introduced by Montgomery Ward in 1908
Vending machines, first widely deployed by Horn & Hardart in 1912
Window shopping displays, popularized by Marshall Field's in 1915