Morrisons, the UK supermarket group which opened the bidding for rival chain Safeway, yesterday [Wednesday] delivered its official submission to the Office of Fair Trading. The group argues that a major league of four national food retailers will promote competition and offer consumers more choice. Sainsbury's and Wal-Mart's Asda have also expressed interested in buying Safeway. Were either to succeed, Morrisons argues that a superleague of just three players would be created. If Morrisons merges with Safeway, this would create a fourth serious player able to stimulate competition.