On September 6, 1916, Clarence Saunders opened the first self-service grocery store called Piggly Wiggly in Memphis, Tennessee. Prior to this, grocery stores required customers to provide clerks with lists who would then collect and bag items. Saunders' innovative store design allowed customers to directly select products themselves from aisles and purchase lower priced items without a clerk's markup. The self-service model was hugely successful and helped Piggly Wiggly stores proliferate across the South and Midwest in following decades, revolutionizing the grocery shopping experience.