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

Before the digital era transformed shopping forever, retail underwent several significant revolutions that shaped how we buy and sell goods today. From the emergence of department stores in the 19th century to the introduction of self-service supermarkets and beyond, retail innovation has continuously evolved to meet consumer demands and technological capabilities. Test your knowledge of these pivotal moments in retail history that set the foundation for modern commerce!

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Piggly Wiggly's self-service model (1916)
A&P's discount pricing strategy (1912)
Sears' mail-order catalog system (1893)
Woolworth's fixed-price merchandise policy (1879)