To guarantee that the factories won't have to shut down for lack of materials, a total of three months of inventory--one month for shipping, one month for current use, and one month of true inventory--is needed. That means that the company must be able to carry nearly US $ 10 million in inventory.
為了確保工廠不會發生缺料停工的現象，包括船運一個月，現場一個月和倉庫一個月，至少要準備三個月近一千萬美金的周轉金才行。