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

Test your knowledge about a pivotal innovation in retail history that transformed how we shop today! In the early 20th century, retail underwent a fundamental shift that changed the relationship between customers and products. This innovation revolutionized store layouts, customer behavior, and eventually led to the modern shopping experience we take for granted. Can you identify this retail breakthrough that forever changed commerce?

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Self-service grocery stores (Piggly Wiggly model)
Department store catalogs with mail-order capability
Mechanical cash registers with printed receipts
Installment payment plans for household goods