Japan Toyota Motor Company has a very famous example in which the "0 stock plan" is operated, and they accurate the number of vehicles to a bit number. They believe that "the so-called safety stock is actually an excuse", it is a waste of management. So their various types of plans are accurate to the production of the automobile, such as production and sales of 1047 departments, requiring suppliers to provide 1047 car glass, requiring tire suppliers to provide 1047 sets of tires. Toyota's suppliers have more than 200 suppliers, but Toyota will not book a glass, a tire. When delivery, more than 200 suppliers are delivered within 1 minute. These components are sent to Toyota Company without entering the warehouse, directly working, production, so effectively saving costs. This precision, efficient business philosophy is the root cause of Toyota in fierce competition.
Only negligible is manageable.