Inventory management

1. What is the major difference between production business and trading business ?
2. what are the 4 type of inventory ?
3. what is quality control and inventory mgt ?
4. what are the benefit of managing inventory ?
5. What do you mean by first in first out (Fifo) ?
6. what is inventory management ?
7. what are the benefit of six sigma ?
8. what are the difference between Fifo and Lifo ?
9. what are the 2 type of inventory cost ?
10. what are 2 form of demand ?
11. what is the purpose of inventory ?