Kevin Drum at Calpundit has been running a series from the LA Times on Wal-Mart. Fast Company magazine has a story in their December issue which is just as fascinating and is a real insight into the realities of the company.

A gallon-sized jar of whole pickles is something to behold. The jar is the size of a small aquarium. The fat green pickles, floating in swampy juice, look reptilian, their shapes exaggerated by the glass. It weighs 12 pounds, too big to carry with one hand. The gallon jar of pickles is a display of abundance and excess; it is entrancing, and also vaguely unsettling. This is the product that Wal-Mart fell in love with: Vlasic's gallon jar of pickles.

Wal-Mart priced it at $2.97--a year's supply of pickles for less than $3! "They were using it as a 'statement' item," says Pat Hunn, who calls himself the "mad scientist" of Vlasic's gallon jar. "Wal-Mart was putting it before consumers, saying, This represents what Wal-Mart's about. You can buy a stinkin' gallon of pickles for $2.97. And it's the nation's number-one brand."
...
Wal-Mart is not just the world's largest retailer. It's the world's largest company--bigger than ExxonMobil, General Motors, and General Electric. The scale can be hard to absorb. Wal-Mart sold $244.5 billion worth of goods last year. It sells in three months what number-two retailer Home Depot sells in a year. And in its own category of general merchandise and groceries, Wal-Mart no longer has any real rivals. It does more business than Target, Sears, Kmart, J.C. Penney, Safeway, and Kroger combined. "Clearly," says Edward Fox, head of Southern Methodist University's J.C. Penney Center for Retailing Excellence, "Wal-Mart is more powerful than any retailer has ever been." It is, in fact, so big and so furtively powerful as to have become an entirely different order of corporate being.

Wal-Mart wields its power for just one purpose: to bring the lowest possible prices to its customers. At Wal-Mart, that goal is never reached. The retailer has a clear policy for suppliers: On basic products that don't change, the price Wal-Mart will pay, and will charge shoppers, must drop year after year. But what almost no one outside the world of Wal-Mart and its 21,000 suppliers knows is the high cost of those low prices. Wal-Mart has the power to squeeze profit-killing concessions from vendors. To survive in the face of its pricing demands, makers of everything from bras to bicycles to blue jeans have had to lay off employees and close U.S. plants in favor of outsourcing products from overseas.