Which retail innovation, first introduced in 1916, revolutionized shopping by allowing customers to select products themselves rather than requesting items from clerks behind counters?

The way we shop today seems intuitive, but retail innovations have dramatically transformed the shopping experience over the decades. One revolutionary concept changed how consumers interact with products in stores forever, eliminating the need for clerk assistance and allowing customers to browse and select items themselves. This innovation fundamentally reshaped retail strategy and store design across the globe. Can you identify this pivotal retail breakthrough that changed shopping forever?

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Self-checkout kiosks
The shopping cart (invented in 1937)
The self-service grocery store (Piggly Wiggly)
Barcode scanning systems