Identify key reasons

Identify key reasons that organisations may need to hold inventories. What factors may lead an organisation to change the level of inventories that it holds? How could such a decision affect the other elements of working capital? Give 2 real company examples too.

My requirements.
1- Please choose 2 real companies to discuss.
2- Please use more than one website on reference.
3- Need at least 3-4 Reference
4- Please use Harvard style.
5- Referencing (in text citation) should be evident in the discussions.
Plagiarism level allowed 2% only otherwise it will not acceptable.
6- This assignment for master degree please do your best effort to get A or B grade.
Please use in assignment the following:-
1- Introduction.(defined the main terms).
2- Body. (Discussion).
3- Conclusion.(summarize the main points).