Wal-Mart Struggles to Restock Store Shelves as U.S. Sales Slump

Wal-Mart Struggles to Restock Store Shelves as U.S. Sales Slump

Andrew Harrer/Bloomberg

An employee stocks the beer cooler at a Wal-Mart store in Alexandria, Virginia. For much of its history, Wal-Mart has been considered a master of logistics, persuading suppliers to set up shop near its operations.