Make-to-stock and make-to-order systems

Discuss a variety of supply contracts for strategic components, both in make-to-stock and make-to-order systems, which can be used to coordinate the supply chain.
a. Why do make-to-stock and make-to-order systems require different types of supply contracts?
b. Consider contracts for make-to-stock systems. What are the advantages and disadvantages of each type of contract? Why would you select one over the others?
c. c. Consider contracts for make-to-order systems. What are the advantages and disadvantages of each type of contract? Why would you select one over the others?