Which retail innovation, first introduced in 1916, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems natural, but it was once revolutionary. Before modern retail innovations, customers never touched products until after purchase - shop clerks would fetch items from behind counters. One groundbreaking invention changed retail forever by introducing the concept of self-service shopping. Test your knowledge about this pivotal moment in retail history that transformed the consumer experience and laid the foundation for modern shopping as we know it today.

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Piggly Wiggly's self-service grocery store
Sears Roebuck's mail-order catalog system
Woolworth's 'five-and-dime' fixed pricing model
A&P's chain store distribution network