By Trefis.comWal-Mart ( WMT) is by far the largest retailer in the world with more than $400 billion in store revenues in 2009, far ahead of competitors like Costco ( COST), Target ( TGT) and Best Buy ( BBY). Retail and consumer goods manufacturers realize significant sales through Wal-Mart's retail channel. This gives Wal-Mart leverage to influence and push suppliers to sell at cheaper prices. Wal-Mart, with its power over suppliers and strong credit quality, can thus efficiently manage its working capital. Below we briefly discuss the components of Wal-Mart's working capital, and how they together add value to the company.