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 the early 20th century, retail shopping meant asking clerks behind counters to fetch items for you. One pioneering invention changed everything and gave birth to the modern shopping experience we now take for granted. Test your knowledge about this pivotal retail innovation that transformed commerce forever.

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
Marshall Field's department store escalators
F.W. Woolworth's five-and-dime pricing structure