Which retail innovation, first introduced in 1916, allowed customers to select their own merchandise without clerk assistance and fundamentally transformed shopping behavior?

Before the 1900s, retail shopping looked very different from what we experience today. Customers would give their shopping lists to clerks who would gather products from behind counters or from stockrooms. This poll explores a pivotal innovation that fundamentally changed how consumers interact with products in stores - an innovation we now take for granted but that revolutionized retail history and consumer behavior.

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Piggly Wiggly's self-service grocery store concept
Sears Roebuck's mail-order catalog shopping system
Marshall Field's introduction of price tags on merchandise
F.W. Woolworth's fixed-price 'five and dime' store model