“As the low-cost grocer Winn-Dixie filed for bankruptcy [in February 2005], the news sent a shudder — and a sense of tragedy — through the world of stockholder-owned grocery stores. The bankruptcy — one of the larger corporate collapses in retail food history — is the latest in some 26 recent supermarket chain bankruptcies, a parable of a trip to the grocery store gone awry amid changes in the very concept of dinner.”