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

The retail landscape has transformed dramatically over the past century, with innovations reshaping how consumers interact with stores and products. One of the most fundamental shifts occurred when traditional clerk-service shopping was challenged by a revolutionary new concept. This historical retail innovation permanently changed shopping behavior and set the foundation for modern supermarkets and department stores as we know them today.

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Piggly Wiggly (the first true self-service grocery store)
Woolworth's Five and Dime (the first discount department store)
Marshall Field's Shopping Baskets (the first shopping cart precursor)
Sears Roebuck's Self-Selection Counters (the first open merchandise displays)