Define five levers in supply chain management.

Part $2$: Advantages and Disadvantages

Investigate the concept of five levers and its relevance in today's global supply chain landscape. How does it contribute to achieving greater supply chain efficiency and effectiveness?

Part $3$: Case Studies

Select a real$-$world company that utilized these five levers. Describe the company's supply chain, its decision and how they deployed these five levers in the company.