Clarence Saunders developed an American supermarket chain whose first outlet opened in what year?
Clarence Saunders (grocer): Clarence Saunders (August 9, 1881 – September 23, 1953) was an American grocer who first developed the modern retail sales model of self service. Piggly Wiggly:  Its first outlet opened in 1916 in Memphis, Tennessee, and is notable for having been the first true self-service grocery store, and the originator of various familiar supermarket features such as checkout stands, individual item price marking and shopping carts.
i don't know