Which two of the following statements are true in the context of a just in time (JIT) inventory system? 1. It can result in much reduced inventory holding costs. 2. It inevitably increases the need for safety inventories 3. It requires suppliers to operate sound quality control procedures 4. It works best if supplies are obtained from a number of different suppliers
The correct answer given was 1 and 3. However, I still don’t understand why 3 is correct. Could you also explain why 2 and 4 are wrong?