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

Before the 1910s, grocery shopping was completely different from what we know today. Store clerks would gather items for customers from behind counters, a time-consuming process that limited selection and shopping experience. Then came a revolutionary retail innovation that fundamentally changed how people shop. This trivia question explores a pivotal moment in retail history that transformed consumer culture and laid the groundwork for modern shopping experiences.

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Piggly Wiggly self-service stores
A&P's 'economy stores' with standardized layouts
Woolworth's department store model
Montgomery Ward's mail-order catalogs