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

Test your knowledge about one of history's most significant retail innovations that transformed how people shop! This innovation from the early 20th century fundamentally changed retail marketing strategies, customer behaviors, and created entirely new shopping patterns that we still see today. The concept was revolutionary when first introduced and met with skepticism, but quickly proved to be the future of retail. Do you know which retail innovation changed everything?

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Self-service grocery stores (Piggly Wiggly)
Department stores with multiple floors (Macy's)
Mail-order catalogs (Sears Roebuck)
Retail membership clubs (Costco model)