For a global supply chain, exchange rates and inflation are important factors that:.
a. affect the supply chain surplus.
b. not likely to be stable over time in all locations.
c. not likely to predict precisely in advance.
d. all above are true.

Statistical process control charts: a. indicate to the operator the true quality of material leaving the process. b. display upper and lower limits for process variables or attributes and signal when a process is no longer in control. c. indicate to the process operator the average outgoing quality of each lot. d. display the measurements on every item being produced. e. are a graphic way of classifying problems by their level of importance, often referred to as the 80-20 rule.