For a clue to the future of online grocery shopping, take a look back at the history of Piggly Wiggly, the iconic supermarket banner. In 1916, Clarence Saunders, founder of the original Piggly Wiggly stores, opened the inaugural self-service grocery store in Memphis, Tenn. For the first time, customers, rather than store employees, picked their own items and brought them to a cashier. This became — and remains in 2012 — the de facto format for all supermarkets. But in 1937
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