2) If the supplier and manufacturer have determined the components liability period, the impact of changing I on the supplier’s total cost is relatively small. With the increase of I, the supplier’s total cost will increase, and components service level will go up. From the above analysis, as for the manufacturer, components liability period T has a very significant impact on the share of inventory cost between the supplier and manufacturer in supply chain. The lower bound of components safety inventory I determines the service level. In business practice, liability period T determines the apportionment of components inventory cost, which has a great impact on the total cost of both two sides. Further, the relative power of the manufacturer and supplier in supply chain finally determines liability period T.