My Wal Mart hosts took me over to the 1.2-million-square-foot distribution center, where we climbed up to a viewing perch and watched the show. On one side of the building, scores of white Wal-Mart trailer trucks were dropping off boxes of merchandise from thousands of different suppliers. Boxes large and small were fed up a conveyor belt at each loading dock. These little conveyor belts fed into bigger belt, like streams feeding into a powerful river. The suppliers ' trucks feed the twelve miles of streams, and the conveyor systems conveyor streams feed into a huge Wal-Mart river of boxed products. But it is just half the show. As the Wal-Mart river flows along, an electric eye reads the bar codes on each box on its way to the other side of the building. There, the river parts again into a hundred streams. Electric arms from each stream reach out and guide boxes-ordered by particular Wal Mart stores off the main river and its down stream, where another conveyor belt sweeps them into a waiting Wal-Mart truck, which will rush these particular products onto the shelves of a particular Wal-Mart store somewhere in the country. There, a consumer will lift one of these products off the shelf, and the cashier will scan it in, and the moment that happens, a signal will be generated. That signal will go out across the Wal-Mart network to the supplier of that product-whether that suppier
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