Since its founding in 1962, Wal-Mart has completely revolutionized the retail industry. Its emphasis on low prices and efficiency has spread throughout the industry, spawning a surge in price competition and consolidation among food retailers. Customers benefit significantly from the lower prices Wal-Mart offers; in fact, the economic consulting firm Global Insight estimates that Wal-Mart had saved consumers a cumulative total of $263 billion by 2004. Wal-Mart's impact is not all positive, however, especially for other retailers and the companies that supply Wal-Mart's products. Smaller retailers are sometimes unable to compete with Wal-Mart's pricing power and varied offerings, forcing them to consolidate or go under all together. As for suppliers, Wal-Mart's growing significance to manufacturers' bottom line gives it a great deal of leverage to negotiate lower prices. While a business relationship with Wal-Mart can boost sales volume and revenues, the quest for the absolute lowest prices for consumers can put pressure on profit margins.