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

Before the 1900s, shopping was a very different experience. Store clerks would retrieve items for customers from behind counters, and shoppers rarely handled products before purchase. Then came a retail revolution that forever changed how we shop. This innovation fundamentally transformed consumer behavior, store layouts, product packaging, and eventually led to the modern supermarket and department store experience we know today.

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Piggly Wiggly (the first true self-service grocery store)
The Bon Marché (the first department store with fixed prices)
Sears Catalog (the first mail-order retail system)
F.W. Woolworth (the first five-and-dime store)