For instance, after the manufacturers dropped off their goods at the Wal-Mart distribution center, Wal-Mart needed to deliver those goods in small bunches to each of its stores. It meant that Wal-Mart had trucks going all over America. Walton quickly realized if he connected his drivers by radios and satellites, after they dropped off at a certain Wal-Mart store, they could go a few miles down the road and pick up goods from a manufacturer so they wouldn't come back empty and so Wal-Mart could save the delivery charges from that manufacturer. A few pennies here, a few pennies there, and the result is more volume, scope, and scale.
In improving its supply chain, Wal-Mart leaves no link untouched. While I was touring the Wal-Mart distribution center in Bentonville, I noticed that some boxes were too big to go on the conveyor belts and were being moved around on pallets by Wal-Mart employees driving special minilift trucks with headphones on. A computer tracks how many pallets each employee is plucking every hour to put onto trucks for different stores, and a computerized voice tells each of them whether he is ahead of schedule or behind schedule. “You can choose whether you want your computer voice to be a man or a woman, and you can choose English or Spanish,” explained Rollin Ford, Wal-Mart's executive vice president, who oversees the supply chain and was giving me my tour.
A few years ago, these pallet drivers would get written instructions for where to pluck a certain pallet and what truck to take it to, but Wal-Mart discovered that by giving them headphones with a soothing computer voice to instruct them, drivers could use both hands and not have to carry pieces of paper. And by having the voice constantly reminding them whether they were behind or ahead of expectations, “we got a boost in productivity,” said Ford. It is a million tiny operational innovations like this that differentiate Wal-Mart's supply chain.
But the real breakthrough, said Glass, was when Wal-Mart realized that while it had to be a tough bargainer with its manufacturers on price, at the same time the two had to collaborate to create value for each other horizontally if Wal-Mart was going to keep driving down costs. Wal-Mart was one of the first companies to introduce computers to track store sales and inventory and was the first to develop a computerized network in order to share this information with suppliers. Wal-Mart's theory was that the more information everyone had about what customers were pulling off the shelves, the more efficient Wal-Mart's buying would be, the quicker its suppliers could adapt to changing market demand.
In 1983, Wal-Mart invested in point-of-sale terminals, which simultaneously rang up sales and tracked inventory deductions for rapid resup-ply. Four years later, it installed a large-scale satellite system linking all of the stores to company headquarters, giving Wal-Mart's central computer system real-time inventory data and paving the way for a supply chain greased by information and humming down to the last atom of efficiency. A major supplier can now tap into Wal-Mart's Retail Link private extranet system to see exactly how its products are selling and when it might need to up its production.
“Opening its sales and inventory databases to suppliers is what made Wal-Mart the powerhouse it is today, says Rena Granofsky, a senior partner at J. C. Williams Group Ltd., a Toronto-based retail consulting firm,” in the 2002 Computerworld article on Wal-Mart. “While its competition guarded sales information, Wal-Mart approached its suppliers as if they were partners, not adversaries, says Granofsky. By implementing a collaborative planning, forecasting, and replenishment (CPFR) program, Wal-Mart began a just-in-time inventory program that reduced carrying costs for both the retailer and its suppliers. 'There's a lot less excess inventory in the supply chain because of it/ Granofsky says.” Thanks to the efficiency of its supply chain alone, Wal-Mart's cost of goods is estimated to be 5 to 10 percent less than that of most of its competitors.