Which retail innovation, first implemented in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise and is considered the precursor to modern supermarkets?

Before modern supermarkets transformed how we shop, grocery stores operated quite differently. Customers would hand their shopping lists to clerks who would gather items from behind counters. This poll explores a pivotal innovation in retail history that fundamentally changed the shopping experience forever and laid the groundwork for modern retail as we know it today.

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Piggly Wiggly self-service stores
Woolworth's cash-only registers
Sears Roebuck mail-order catalogs
A&P's shopping cart system