Wal-Mart’s impact on supplier profits Qingyi Huang 1 Vincent Nijs 2 Karsten Hansen 3 Eric T. Anderson 4 September 11, 2009 1 Kellogg School of Management, Northwestern University 2 Kellogg School of Management, Northwestern University 3 Rady School of Management, University of California, San Diego 4 Kellogg School of Management, Northwestern University