Which retail innovation, first introduced in 1916, revolutionized the customer journey by allowing shoppers to select their own merchandise without clerk assistance?

The retail customer journey has evolved dramatically over the past century. Before the innovation we now take for granted, shopping involved clerks retrieving all items for customers from behind counters - a time-consuming process with limited product visibility. One revolutionary concept forever changed how we shop, giving birth to the modern retail experience we know today. Test your knowledge about this pivotal moment in retail history that transformed the customer journey and shopping behaviors worldwide.

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The self-service grocery store (Piggly Wiggly, founded by Clarence Saunders)
The department store credit card (introduced by Strawbridge & Clothier)
The shopping mall concept (Highland Park Village in Dallas)
The home shopping catalog (Montgomery Ward's mail-order business)