Peggy Knight, a supplier consultant and retired Wal-Mart manager, said the new management regime of CEO Doug McMillon is watching sales and expense ratios, with more focus placed on e-commerce. The retailer is in the process of a $2 billion investment in e-commerce. Knight said with the complete management turnover in the U.S. segment since the Express format was introduced in 2011, the new mindset is focusing on proven models of success such as the supercenters and Neighborhood Markets.