A supply chain is dynamic and involves the constant flow of information, product, and funds between different stages. In our example, Wal-Mart provides the product, as well as pricing and availability information, to the customer. The customer transfers funds to Wal-Mart. Wal-Mart conveys point-of-sales data as well replenishment order to the warehouse or distributor, who transfers the replenishment order via trucks back to the store. Wal-Mart Transfers funds to the distributor after the replenishment . The distributor also provides pricing information and sends delivery schedules to Wal-Mart. Similar in formation, material and fund flows take place across the entire supply chain.