Wal-Mart has become a global leader in supply chain management through strategic investments and innovations over several decades. It was one of the first retailers to link stores and distribution centers through computer systems in the 1970s. Key developments include adopting RFID technology in 2004 to provide real-time sales data and reducing intermediaries in global sourcing by 2010. These supply chain strategies have supported Wal-Mart's incredible growth, allowing it to do $1 billion in business every 36 hours by 2001. Its efficient supply chain provides sustainable competitive advantages like lower costs and highly competitive pricing for consumers.